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 MLP-MP62-U, MOUNTING PRESS(BASIC TYPE), 1.18" DIA (Customizable .87" DIA, 1.77" DIA), 6974029771439
3M 14197, Roloc Disc Pad TP, Medium 2 in 1/4-20 Internal, 7000119311
Dynabrade 98580 Motor Tune-Up Kit for National Detroit Sander Models
3M 03140, General Purpose Sanding Sponge CP041-6P, Single Angle, 2-7/8 in x 4-7/8 in x 1 in, Medium, 7100101537, 6/pack 