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?).

Dynabrade 94960 1/4" Composite-Style Coupler, 1/4" Female
3M 47207, Polyurethane Adhesive Sealant 560, Gray, 600 mL Sausage Pack, 7100198015, 12/Case
Insize 4807, ANGLE GAGE SET, 6928640319341
3M 20927, PSA Cloth Disc 348D, P240 X-weight, 1 in x NH, Die 100N, 7000118918
3M 26016, PPS Series 2.0 Adapter, Type S9, 16 mm Male, 1.5 mm Thread, 7100135330 