GZ01224 | Groz Deg. Protractor Rectangular Head 150mm Blade Manufactured from stainless steel the Degree Protractor comes with a semi-circular or a rectangular head. The head has permanent deep etched graduations 0° to 180° in opposite directions thus permitting reading an angle directly and also its supplement. The 150 mm blade has a graduation line on one end that permits accurate setting and reading of angles. The blade can be firmly set at the desired angle by means of a knurled nut. This is an ideal tool for machinists draftsmen and mechanics for setting bevels transferring angles small squaring tasks checking cutter clearances within limits etc. The rectangular head provides additional convenience as it incorporates 4 working edges. Angular Tolerance: 0.5° Specification Head Shape: Rectangular Blade Length: 150mm