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 Cubitron 3 Roloc Fibre Disc 1187C, 36+, TR, Purple, 3 in, Die R300V, 200 ea/Case, 7100331749 