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 97566 1/4" Safety Coupler, Female
Dynabrade 94991 1/4" Female Composite-Style Coupler with 1/4" Female Plug Assembly
3M 26130, PPS Series 2.0 Adapter, Type S35, 16 mm Female, 1.5 mm
Thread Stretched, 7100135926
Dynabrade 98265 3/8" Female Coupler with 3/8" Male Plug Assembly
Dynabrade 98271 1/2" NPT Male Plug
Insize 4808, WIRE GAGE, 0-36(.3249~.0050"), 6928640330155
3M 26432, PPS Series 2.0 Sealing Plug, 96 plugs per pack, 7100135627
Dynabrade 94960 1/4" Composite-Style Coupler, 1/4" Female
Dynabrade 98272 1/2" NPT Female Plug
3M 33440, Cubitron II File Belt, 33440, 80+, 10 mm x 330 mm (3/8 in x 13 in), 7100033195, 10 belts per carton, 5 cartons per case
Dynabrade 98263 3/8" NPT Male Plug
3M 93949, General Purpose Sanding Sponge CP040-3PK, Single Angle, 2-7/8 in x 4-7/8 in x 1 in, Fine, 7100175194, 3/pack 