Best Set Square Plastic Large of 2026

Last updated on 04/04/2026
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1
Faithfull Roofing Rafter Framing Square – Heavy-Duty Steel Carpenter's Square with Metric & Imperial Markings, Conversion Chart & Hanging Hole - 600 x 400mm (24 x 16in)
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Faithfull Roofing Rafter Framing Square – Heavy-Duty Steel Carpenter's Square with Metric & Imperial Markings, Conversion Chart & Hanging Hole - 600 x 400mm (24 x 16in)

Faithfull
17% Off
Why we love it
  • Simple and user-friendly.
  • Affordable and great value.
  • Highly functional ruler.
Main Highlights
  • Heavy-Duty Steel Construction with Integrated Hanging Hole – Built from robust steel for long-lasting durability and reliable performance in measuring and marking tasks, even with regular use. The integrated hanging hole allows for easy wall or pegboard storage.
  • Black Powder-Coated Finish – Corrosion-resistant finish protects the square in harsh working conditions, ensuring clean, visible markings over time.
  • Metric & Imperial Markings –– Clearly graduated on both sides with metric (mm/cm) and imperial (inches) scales for precision measuring in any standard.
  • Built-in Roofing Conversion Chart – Includes printed reference guide for rafter cuts, roof pitch calculations and rise measurements, saving time and reducing errors during complex layouts.
  • Faithfull 5 Years Manufacturers Guarantee - Offering durability, efficiency and accuracy, the Faithfull Roofing Square delivers high performance in carpentry, framing, roofing and general marking and measuring tasks.
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9.8
Exceptional
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9.8
Exceptional
Faithfull

Faithfull Roofing Rafter Framing Square – Heavy-Duty Steel Carpenter's Square with Metric & Imperial Markings, Conversion Chart & Hanging Hole - 600 x 400mm (24 x 16in)

17% Off
Why we love it
  • Simple and user-friendly.
  • Affordable and great value.
  • Highly functional ruler.
Main Highlights
  • Heavy-Duty Steel Construction with Integrated Hanging Hole – Built from robust steel for long-lasting durability and reliable performance in measuring and marking tasks, even with regular use. The integrated hanging hole allows for easy wall or pegboard storage.
  • Black Powder-Coated Finish – Corrosion-resistant finish protects the square in harsh working conditions, ensuring clean, visible markings over time.
  • Metric & Imperial Markings –– Clearly graduated on both sides with metric (mm/cm) and imperial (inches) scales for precision measuring in any standard.
  • Built-in Roofing Conversion Chart – Includes printed reference guide for rafter cuts, roof pitch calculations and rise measurements, saving time and reducing errors during complex layouts.
  • Faithfull 5 Years Manufacturers Guarantee - Offering durability, efficiency and accuracy, the Faithfull Roofing Square delivers high performance in carpentry, framing, roofing and general marking and measuring tasks.
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Value for Money
2
Pack of 2 Large Transparent Metric Triangle Ruler Set Square: 30 CM (12 Inch) - 30/60 Degree & 22 CM (9 inch) 45/90 Degree | Essential for School and Work use (CM Scale)
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Pack of 2 Large Transparent Metric Triangle Ruler Set Square: 30 CM (12 Inch) - 30/60 Degree & 22 CM (9 inch) 45/90 Degree | Essential for School and Work use (CM Scale)

Yosogo
Why we love it
  • Accurate for precise measurements.
  • Lightweight and easy to carry.
  • Durable and cost-effective design.
Main Highlights
  • ACCURATE: Our high quality triangle metric set squares are made out of acrylic plastic which improves stability and accuracy when drafting or drawing. With its laser-etched markings that wont fade or rub off, you can see the numbers clearly and be assured of sharp graduation and precise scale.
  • EASY TO USE: These large triangle rulers are easy to grip with its hollow cut out centers and easy to use on any surfaces. The black-on-blue design eases distinction of lines and numbers so you can read comfortably, preventing unnecessary eye strain. In addition, these lightweight square sets are only half the weight of a glass which makes it easy for you to carry around for school and work.
  • WIDE APPLICATION: Our acrylic triangle set square rulers are highly useful tools for both school and work. These are suitable for architects, engineers, drafting technicians, artists, designers, students, teachers and more professional and precise applications.
  • A LOT OF HAPPY CUSTOMERS: We have had many happy customers which have made us a professionals choice for drafting tools and drawing supplies for many years now. It could mean a lot to us if you could let us bridge the gap for you between ideas and innovations. If for any reason you are having trouble with these set squares; please contact us online, and we will make things right."
  • International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.
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9.6
Superb
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9.6
Superb
Yosogo

Pack of 2 Large Transparent Metric Triangle Ruler Set Square: 30 CM (12 Inch) - 30/60 Degree & 22 CM (9 inch) 45/90 Degree | Essential for School and Work use (CM Scale)

Why we love it
  • Accurate for precise measurements.
  • Lightweight and easy to carry.
  • Durable and cost-effective design.
Main Highlights
  • ACCURATE: Our high quality triangle metric set squares are made out of acrylic plastic which improves stability and accuracy when drafting or drawing. With its laser-etched markings that wont fade or rub off, you can see the numbers clearly and be assured of sharp graduation and precise scale.
  • EASY TO USE: These large triangle rulers are easy to grip with its hollow cut out centers and easy to use on any surfaces. The black-on-blue design eases distinction of lines and numbers so you can read comfortably, preventing unnecessary eye strain. In addition, these lightweight square sets are only half the weight of a glass which makes it easy for you to carry around for school and work.
  • WIDE APPLICATION: Our acrylic triangle set square rulers are highly useful tools for both school and work. These are suitable for architects, engineers, drafting technicians, artists, designers, students, teachers and more professional and precise applications.
  • A LOT OF HAPPY CUSTOMERS: We have had many happy customers which have made us a professionals choice for drafting tools and drawing supplies for many years now. It could mean a lot to us if you could let us bridge the gap for you between ideas and innovations. If for any reason you are having trouble with these set squares; please contact us online, and we will make things right."
  • International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.
Show More
3
Staedtler Mars 567 36-60 Set Square 36 cm 60/30 Degree - Blue

Staedtler Mars 567 36-60 Set Square 36 cm 60/30 Degree - Blue

STAEDTLER
18% Off
Why we love it
  • Sleek translucent blue design.
  • Convenient inking edge feature.
  • Precise calibrated measurements in mm.
Main Highlights
  • Design includes inking edge
  • Made from plastic
  • Scale begins directly at the edge
  • Available in translucent blue colour
  • Calibrated in mm
Show More
9.6
Superb
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9.6
Superb
STAEDTLER

Staedtler Mars 567 36-60 Set Square 36 cm 60/30 Degree - Blue

18% Off
Why we love it
  • Sleek translucent blue design.
  • Convenient inking edge feature.
  • Precise calibrated measurements in mm.
Main Highlights
  • Design includes inking edge
  • Made from plastic
  • Scale begins directly at the edge
  • Available in translucent blue colour
  • Calibrated in mm
Show More
4
Liquidraw Geometry Set - 5 Piece | 2 x Set Square Triangle Ruler, Semi Circle Protractor, Circle Protractor, 12" Ruler | Professional Quality | Work or School Supplies | Mm & Inch Markings | Clear
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Liquidraw Geometry Set - 5 Piece | 2 x Set Square Triangle Ruler, Semi Circle Protractor, Circle Protractor, 12" Ruler | Professional Quality | Work or School Supplies | Mm & Inch Markings | Clear

Liquidraw
9% Off
Why we love it
  • Durable and precise measurement tools.
  • Versatile for various geometric tasks.
  • Easy-to-read dual markings.
Main Highlights
  • MATHS KIT ESSENTIALS: This stationery set has all the tools required for professional use in the workplace; it also contains essential supplies for learning geometry or advanced maths or science at college, university or school
  • 5 PIECE SET: This kit includes 1 x set square 45° 25cm / 10", 1 x set square 60° 30cm / 12", 1 x semi circular protractor 180°, 1 x circle protractor 360° / 5.5" & 1 x 12" ruler in clear, transparent plastic
  • MM & INCHES: With markings in inches & millimetres (easily convertible to centimetres), this set provides accurate & precise measurements with every use, perfect for school, work or art & design
  • DURABLE & TRANSPARENT: Made from strong, clear plastic, these tools allow you to see the page or work surface below; they are long-lasting, designed to resist bending or cracking for everyday use
  • EASY TO TRANSPORT: Each item in this lightweight set is 2.9 mm thick, light & portable; easy to carry in a bag, pencil case or tool set box; this set is ideal for secondary school students, architecture students, artists & more
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9.6
Superb
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9.6
Superb
Liquidraw

Liquidraw Geometry Set - 5 Piece | 2 x Set Square Triangle Ruler, Semi Circle Protractor, Circle Protractor, 12" Ruler | Professional Quality | Work or School Supplies | Mm & Inch Markings | Clear

9% Off
Why we love it
  • Durable and precise measurement tools.
  • Versatile for various geometric tasks.
  • Easy-to-read dual markings.
Main Highlights
  • MATHS KIT ESSENTIALS: This stationery set has all the tools required for professional use in the workplace; it also contains essential supplies for learning geometry or advanced maths or science at college, university or school
  • 5 PIECE SET: This kit includes 1 x set square 45° 25cm / 10", 1 x set square 60° 30cm / 12", 1 x semi circular protractor 180°, 1 x circle protractor 360° / 5.5" & 1 x 12" ruler in clear, transparent plastic
  • MM & INCHES: With markings in inches & millimetres (easily convertible to centimetres), this set provides accurate & precise measurements with every use, perfect for school, work or art & design
  • DURABLE & TRANSPARENT: Made from strong, clear plastic, these tools allow you to see the page or work surface below; they are long-lasting, designed to resist bending or cracking for everyday use
  • EASY TO TRANSPORT: Each item in this lightweight set is 2.9 mm thick, light & portable; easy to carry in a bag, pencil case or tool set box; this set is ideal for secondary school students, architecture students, artists & more
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5
Artway Adjustable Set Square - 30cm - Acrylic
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Artway Adjustable Set Square - 30cm - Acrylic

Artway
Why we love it
  • High quality acrylic material.
  • Adjustable for various angles.
  • Comes with protective case.
Main Highlights
  • 30CM ADJUSTABLE SET SQUARE – A large 30cm/12-inch set square, easily adjustable to a range of different angles from 0 to 90 degrees.
  • ARCHITECTURE/TECHNICAL DRAWING – An integral tool for anyone needing to make accurate technical drawings. Ideal students and professionals in architecture, engineering, and other technical fields.
  • DURABLE/QUALITY MATERIALS – Made from high quality acrylic plastic, bevelled edge, metal adjustment handle and accurately engraved distance markings in metric/centimetres, and 0 to 90-degree angles.
  • PROTECTIVE CASE – Our adjustable set squares come in a convenient, strong grey protective case, storing, and protecting your equipment while on the move.
  • ARTWAY TECHNICAL EQUIPMENT – As well as our 30cm/12-inch version, our adjustable set square also comes in a 20cm/8-inch version.
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9.5
Superb
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9.5
Superb
Artway

Artway Adjustable Set Square - 30cm - Acrylic

Why we love it
  • High quality acrylic material.
  • Adjustable for various angles.
  • Comes with protective case.
Main Highlights
  • 30CM ADJUSTABLE SET SQUARE – A large 30cm/12-inch set square, easily adjustable to a range of different angles from 0 to 90 degrees.
  • ARCHITECTURE/TECHNICAL DRAWING – An integral tool for anyone needing to make accurate technical drawings. Ideal students and professionals in architecture, engineering, and other technical fields.
  • DURABLE/QUALITY MATERIALS – Made from high quality acrylic plastic, bevelled edge, metal adjustment handle and accurately engraved distance markings in metric/centimetres, and 0 to 90-degree angles.
  • PROTECTIVE CASE – Our adjustable set squares come in a convenient, strong grey protective case, storing, and protecting your equipment while on the move.
  • ARTWAY TECHNICAL EQUIPMENT – As well as our 30cm/12-inch version, our adjustable set square also comes in a 20cm/8-inch version.
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6
STAEDTLER 567 36-45 Mars Set Square, 36cm 45/45 Degree - Transparent (Pack of 1)
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STAEDTLER 567 36-45 Mars Set Square, 36cm 45/45 Degree - Transparent (Pack of 1)

STAEDTLER
38% Off
Why we love it
  • Inking edge adds precision.
  • Durable plastic construction.
  • Translucent blue for visibility.
Main Highlights
  • Design includes inking edge
  • Made from plastic
  • Scale begins directly at the edge
  • Available in translucent blue colour
  • Calibrated in mm
Show More
9.5
Superb
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9.5
Superb
STAEDTLER

STAEDTLER 567 36-45 Mars Set Square, 36cm 45/45 Degree - Transparent (Pack of 1)

38% Off
Why we love it
  • Inking edge adds precision.
  • Durable plastic construction.
  • Translucent blue for visibility.
Main Highlights
  • Design includes inking edge
  • Made from plastic
  • Scale begins directly at the edge
  • Available in translucent blue colour
  • Calibrated in mm
Show More
7
Helix R36011 Oxford 31cm 45 & 60 degree Set Squares

Helix R36011 Oxford 31cm 45 & 60 degree Set Squares

Helix
20% Off
Why we love it
  • Clarity-enhancing tinted blue.
  • Accurate metric and imperial graduations.
  • Trusted Helix Oxford quality.
Main Highlights
  • 31cm set of set squares: 45 & 60 degree
  • Tinted blue for clarity
  • Easy to read, single colour print
  • Metric and imperial graduations for accurate measuring
  • Part of the traditional Helix Oxford range, A brand trusted for its premium quality and reliability
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9.4
Superb
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9.4
Superb
Helix

Helix R36011 Oxford 31cm 45 & 60 degree Set Squares

20% Off
Why we love it
  • Clarity-enhancing tinted blue.
  • Accurate metric and imperial graduations.
  • Trusted Helix Oxford quality.
Main Highlights
  • 31cm set of set squares: 45 & 60 degree
  • Tinted blue for clarity
  • Easy to read, single colour print
  • Metric and imperial graduations for accurate measuring
  • Part of the traditional Helix Oxford range, A brand trusted for its premium quality and reliability
Show More
8
STAEDTLER 567 31-60 Mars Set Square, 31 cm 60/30 Degree - Transparent Blue (Pack of 1)
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STAEDTLER 567 31-60 Mars Set Square, 31 cm 60/30 Degree - Transparent Blue (Pack of 1)

STAEDTLER
10% Off
Why we love it
  • Transparent blue for clear visibility.
  • Scale starts at the edge.
  • Precise measurements in millimeters.
Main Highlights
  • Plastic, transparent blue
  • With inking edge
  • Scale begins directly at the edge
  • 567 31-60
  • Calibrated in mm
Show More
9.3
Superb
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9.3
Superb
STAEDTLER

STAEDTLER 567 31-60 Mars Set Square, 31 cm 60/30 Degree - Transparent Blue (Pack of 1)

10% Off
Why we love it
  • Transparent blue for clear visibility.
  • Scale starts at the edge.
  • Precise measurements in millimeters.
Main Highlights
  • Plastic, transparent blue
  • With inking edge
  • Scale begins directly at the edge
  • 567 31-60
  • Calibrated in mm
Show More
9
2 PCS Triangle Ruler Square Set 31cm 30/60 and 45/90 Degrees Measuring Tools for Classrooms Home Office, Transparent, triangle ruler
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2 PCS Triangle Ruler Square Set 31cm 30/60 and 45/90 Degrees Measuring Tools for Classrooms Home Office, Transparent, triangle ruler

generic
20% OffEnds in
Why we love it
  • Durable polystyrene plastic material.
  • Accurate protractor for measuring angles.
  • Perfect for various applications.
Main Highlights
  • Size - 2 pcs of large clear triangle rulers, one of the right-angle sides of the 45/90-degree ruler is 30.5cm/12.2 inch and 21.5cm/8.5 inch; the 30/60 degree ruler has a longer bevel side of 31cm/12 inch long and the shorter right-angle side is 17cm/7 inch.
  • Material - The triangle rulers are made of polystyrene plastic, durable, not easy to break for using a long time.
  • The hollow center of 45/ 90 degrees triangle is a protractor that can be applied to measure 0-180 degrees, and the scale is accurate to 1 degree, helping you to quickly measure the value.
  • The measuring ruler kits can use them to measure, and draw geometric figures, etc., providing you with large convenience, suitable for a variety of applications in classrooms, offices, and homes, for artists, designers, architects, engineers etc.
  • 2PCS, 1 x 45/ 90 Degrees triangle ruler, 1 x 30/ 60 Degrees triangle ruler
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9.1
Superb
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9.1
Superb
generic

2 PCS Triangle Ruler Square Set 31cm 30/60 and 45/90 Degrees Measuring Tools for Classrooms Home Office, Transparent, triangle ruler

20% OffEnds in
Why we love it
  • Durable polystyrene plastic material.
  • Accurate protractor for measuring angles.
  • Perfect for various applications.
Main Highlights
  • Size - 2 pcs of large clear triangle rulers, one of the right-angle sides of the 45/90-degree ruler is 30.5cm/12.2 inch and 21.5cm/8.5 inch; the 30/60 degree ruler has a longer bevel side of 31cm/12 inch long and the shorter right-angle side is 17cm/7 inch.
  • Material - The triangle rulers are made of polystyrene plastic, durable, not easy to break for using a long time.
  • The hollow center of 45/ 90 degrees triangle is a protractor that can be applied to measure 0-180 degrees, and the scale is accurate to 1 degree, helping you to quickly measure the value.
  • The measuring ruler kits can use them to measure, and draw geometric figures, etc., providing you with large convenience, suitable for a variety of applications in classrooms, offices, and homes, for artists, designers, architects, engineers etc.
  • 2PCS, 1 x 45/ 90 Degrees triangle ruler, 1 x 30/ 60 Degrees triangle ruler
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10
STAEDTLER 567 26-45 Mars Set Square, 25 cm 45/45 Degree - Transparent (Pack of 1)

STAEDTLER 567 26-45 Mars Set Square, 25 cm 45/45 Degree - Transparent (Pack of 1)

STAEDTLER
Why we love it
  • Stylish inking edge design.
  • Durable plastic material used.
  • Translucent blue for visibility.
Main Highlights
  • Design includes inking edge
  • Made from plastic
  • Scale begins directly at the edge
  • Available in translucent blue colour
  • Calibrated in mm
Show More
9.0
Superb
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9.0
Superb
STAEDTLER

STAEDTLER 567 26-45 Mars Set Square, 25 cm 45/45 Degree - Transparent (Pack of 1)

Why we love it
  • Stylish inking edge design.
  • Durable plastic material used.
  • Translucent blue for visibility.
Main Highlights
  • Design includes inking edge
  • Made from plastic
  • Scale begins directly at the edge
  • Available in translucent blue colour
  • Calibrated in mm
Show More

We scanned 1275 products

We reviewed these offers relevant to the Set Square Plastic Large within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like Faithfull, Yosogo, STAEDTLER, Liquidraw, Artway, Helix, generic, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.
For the best Set Square Plastic Large in the market, we considered we took a deep dive into 6376 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that: