Accuracy: ?2″.
To inspect protractor, taper gage, index plate, index head and goniometer, can also be used to set angle.
Made of special alloy steel, hardness HRC64, high stability, wear resistance and easy combination.
Can be combined to any angle with interval 6 seconds after combination (6″, 12″, 18″, … , 360?).

3M 94443, Speedglas G5-02 Inside Protection Plate with Integrated Airflow Deflector 08-0200-50, 2 ea/Case, 7100241573
3M 82279, Cubitron II Cut and Grind Wheel, T27, 4 1/2 in x 1/8 in x 7/8 in, 7100019243, 20 per case
3M 26138, PPS Series 2.0 Adapter, Type S42, 3/8 Female R-Angle, 19Thread BSP, 7100135930 