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 97570 1/2" NPT Female Safety Coupler
Insize 7240-200, INSIDE CALIPER, 8", 6928640361203
Dynabrade 98269 1/2" Female Coupler
Standard Abrasives 702229, A/O Full Taper Cartridge Roll, 3/8 in x 1 in x 1/8 in 120, 7100085861
3M 26006, PPS Series 2.0 Adapter, Type S5, 12 mm Male, 1.5 mm Thread, 7100135831 