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A 60° 21 cm aluminium set square can last a student for several years, provided you check the right criteria before buying. In the classroom, inside a often-packed school bag, models that are too flexible quickly become warped. On the other hand, a set square that is too heavy or poorly marked can make drawing and geometry exercises more difficult.
So the choice shouldn't come down to colour or a "reinforced" label on the packaging. Here are the main pitfalls to avoid and the points to check before choosing a school set square.
A set square advertised as 21 cm doesn't necessarily have a 21 cm graduated edge. Some manufacturers give the outer dimension, while the actual usable length is slightly shorter. For secondary school exercises, make sure the stated measurement matches the side you'll use for measuring and drawing.
Transparent plastic is lightweight and affordable, but it can twist under pressure or crack after several knocks in a school bag. A silver aluminium set square offers a more rigid structure. However, its corners and edges are still exposed to impacts: they need to be protected to avoid marking paper and to reduce the risk of injury.
A scale that is too fine, printed with poor contrast, or placed too close to a difficult-to-position edge can lead to measurement errors. For technical drawing equipment, the readability of the markings matters just as much as the tool's rigidity.
A 60° school set square allows you to draw angles of 30°, 60° and 90°, depending on its orientation. At 21 cm, it offers a practical compromise for exercise sheets, large-format notebooks and geometric construction tasks. It remains manageable enough for a student, while providing an edge suitable for common drawing tasks.
Before ordering, check the following three points:
Anodised aluminium benefits from a surface treatment that helps limit visual wear and superficial scratches. In the case of the Maped set square, the anodised aluminium construction is said to be resistant to bending, which suits daily use in a school bag.
This doesn't mean the tool is unbreakable. Avoid sitting on your school bag, wedging the set square against a ruler, or storing it under very heavy books without protection.
This model features the Protect System, with protected end caps. According to the product description, these caps are designed to reduce noise and improve safety during handling.
No assembly is required. For maintenance, a soft, slightly damp cloth is sufficient. Ideally, store the instrument in a dry place, away from strong heat and prolonged exposure to sunlight. Like any geometric measuring instrument with angles, it should be handled with care and is not suitable for children under 3 years old.
Why this choice suits this profile: This size is ideal for students who want to replace a basic plastic set square with a more rigid tool, without adding lots of extra accessories to their pencil case.
The description mentions anodised aluminium construction and protected end caps – two features that address the problems of warping and exposed edges.
A 60° angle, 21 cm length, clear graduations and an anodised aluminium finish.
Why this choice suits this profile: It is aimed at users who value finish, rigidity and regular use in geometry or technical drawing.
The scale, described as clear and precise, reduces the risk of choosing a model that is difficult to read during drawing.
Anodised aluminium, a silver finish, a 60° angle and protective end caps designed to reduce noise.
Why this choice suits this profile: Its size and structure are suitable for teachers, secondary school students and anyone who regularly carries out precise drawing tasks.
The stated rigidity of the aluminium helps limit bending, while the graduated markings simplify repeated measurements.
A 21 cm length, a 60° angle, protected end caps and easy cleaning with a soft, damp cloth.
We have compiled a comprehensive, real-time updated list of products that fully meet these strict selection criteria and European safety regulations.
An aluminium set square requires no consumables: its running cost is therefore limited to the initial purchase. Its lifespan depends mainly on how it is stored, the frequency of impacts and the pressure applied during drawing.
Yes, this size is generally suitable for sheets, notebooks and geometric constructions carried out in secondary school and sixth form. It remains compact enough for a pencil case or pouch, while offering a comfortable drawing length.
Aluminium offers a more rigid structure and resists bending better during everyday use. Plastic can still be suitable for occasional or very light use, but you then need to check its transparency, thickness and ability to hold its shape.
Place it on a sheet of paper and check that its edges are even and that the angle sits flush against a ruler known to be straight, with no visible gap. Also check that the graduations start right at the usable edge and remain legible along the entire length.