Triangle Ruler BIC 45° 21 cm – plastic set square for drawing and measuring

BIC 45° triangle ruler, 21 cm, is a lightweight plastic set square designed for accurate drawing, technical sketches and measuring angles. The transparent construction and precisely molded 45° angle allow clear sight of lines beneath the ruler, while the straight 21 cm edge provides a reliable scale for drawing, aligning and measuring. The tool is compatible with pencils, pens and markers and is suitable for classroom, studio and office use.

Advantages

The ruler combines a clearly defined 45° angle with a straight 21 cm measuring edge in a single piece of durable plastic. Transparency ensures good visibility of the work surface and ink lines, while a smooth, chamfered edge supports accurate marking and comfortable handling. Its lightweight design makes it easy to carry and position on paper without slipping, and the material resists minor impacts and daily classroom wear.

Suitable for

• Technical drawing and drafting
• Geometry exercises and school projects
• Architectural sketches and scaled layouts
• Everyday office measuring and alignment tasks

Key specifications

• Angle: 45°
• Length: 21 cm straight edge
• Material: transparent plastic
• Compatibility: suitable for pencil, pen and marker use
• Weight: lightweight handheld design

How to use

Place the triangle ruler on the work surface with the 21 cm edge aligned to the required baseline or guide. Use the 45° edge to draw or check angles by resting a pencil, pen or marker against the ruler’s edge and moving along the length. For measuring, read along the straight edge to mark distances up to 21 cm. Hold the ruler firmly with one hand to prevent movement and ensure straight, consistent lines.

Usage recommendations

To maintain accuracy, store the ruler flat and avoid exposure to high heat or pressure that could warp the plastic. Clean with a soft cloth and mild detergent if needed. For precise technical work, combine the triangle with a straight ruler or T-square to extend measuring range and improve alignment.