Triangle ruler Proline 21330 — technical drawing triangle, 1 pc

Proline 21330 is a single-piece drawing triangle designed for technical drawing, measurement and layout tasks. The triangle combines a rigid structure with dual-sided metric and inch scales to support precise alignment and straight-line guidance for drafting, classroom assignments and workshop marking. Its compact, one-piece design makes it easy to handle, store and integrate into a drawing kit or toolbox.

Advantages

The rigid construction of this Proline triangle provides stability during use, reducing flex and helping maintain accurate lines and angles. Having both metric and inch scales on opposite sides allows seamless switching between measurement systems without needing additional rulers. The single-piece format minimizes moving parts, improving durability and simplifying maintenance.

Suitable for

• Technical drawing and drafting work
• School geometry and engineering exercises
• Workshop marking and layout
• Model making and hobby projects requiring straight edges and angle control

Key specifications

• Construction: single-piece rigid triangle for stable alignment
• Scales: two-sided measurement markings in metric and inch units
• Primary use: guide for straight lines and angle work
• Quantity: 1 piece
• Suitable for hand drawing, measuring and layout tasks

How to use

Place the Proline drawing triangle on the drawing surface with the appropriate face up for the measurement system you need. Align the triangle edge with your reference points or existing lines, and use a pencil or technical pen along the straight edge to draw precise lines or transfer angles. Apply firm but steady pressure to reduce movement and, when measuring, read values from the nearest scale markings. For repetitive layouts, use the triangle as a stable guide against a straightedge or T-square.

Usage recommendations

Store the triangle flat or in a protective sleeve to avoid edge damage. Clean scale markings gently with a soft cloth to preserve readability. When working on delicate media, place a backing sheet under the work to prevent indentations.