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 98270 1/2" Male Coupler
Insize 0010-A35, SOUND LEVEL METER, 35dB~130dB, 6974029777004
Dynabrade 98263 3/8" NPT Male Plug
3M 55694, Stikit Film Disc w/Tab 375L, P180, 5 in x NH, Die 500X, 7100106554, 250 per case
3M 01411, Roloc Brake Rotor Surface Conditioning Disc Refill Pack, P120 grit, 7000120356, 12 discs per pack
Dynabrade 97566 1/4" Safety Coupler, Female 