A professional drafting head designed for the Staedtler Mars drawing board.
- Compatible with both A3 and A4 Staedtler Mars drawing boards
- Single handed use
- Features a STOP-and-GO push button mechanism
- Two transparent rulers with double-sided, opposite-running scales
- Opposite running protractor scales
- Automatic settings at 15 degree intervals
- Uninterrupted drawing of right angles possible