• For use with the drawing boards 661 A3 and A4
• Single-handed use
• Stop-and-go push-button for easy setting at desired angle and freewheeling
• Two transparent ruler arms with double-sided opposite-running scales
• Parallel guide lines serve as hatching aid
• Opposite-running protractor scales from 0°-90° with additional marks at 7° and 42° for dimetric projection
• Automatic settings at 15° intervals
• Uninterrupted drawing of right angles possible

Art. no. 660 20