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 80763, Flap Wheel 747D, T83, 2 in x 1 in x 1/4 in, 60 X-weight, 7100044890, 10 per case
Standard Abrasives 42699, A/O Flexible Flap Wheel 621426, 1 in x 1 in x 1/4-20 in 80, 7010369136, 10 per case
Insize 6144, ACCESSORY SET FOR DIGITAL CALIPERS, 6928640380839
3M 26583, Accuspray Refill Pack for PPS Series 2.0, Green, 1.3 mm, 7100152953
3M 26138, PPS Series 2.0 Adapter, Type S42, 3/8 Female R-Angle, 19Thread BSP, 7100135930 