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?).

Insize 4112-C16, INDIVIDUAL STEEL GAGE BLOCK, 16", grade AS-2, 6928640354113
3M 17184, Scotch-Brite Roloc EXL Unitized Wheel TR, 3 in x NH 2S FIN, 7100005209
Dynabrade 95745 1/4" NPT Speed Regulator
3M 07056, Drywall Sanding Sponge CP-042, Single Angle, 2-7/8 in x 4-7/8 in x 1 in, Fine, 7100101555 