This Staedtler Mars Drafting Arm 661 will help you to achieve more accurate results when drafting and sketching. This arm is compatible with both the A4 and A4 661 drawing board models and is designed for single-hand use with a stop/go push-button to easily set it at your desired angle.

- This drafting arm has a length of 20 cm on one side and 15 cm on the other.
- It uses cm measurements with mm marked in between.
- This drafting arm has a durable plastic material.
- The arm is clear so that you can see the work underneath.
- It has been designed for single-handed use.
- The stop/go push-button allows you to easily set it at your desired angle and freewheeling.
- It has protractor scales from 0 to 90 degrees with marks at 7 and 42 degrees for dimetric projection.
- It also has automatic settings at 15 degree intervals.
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