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 1120-5001, DIGITAL INSIDE GROOVE CALIPER, 2.36-20"/60-500mm, 6940561961041
3M 27723, Cubitron II Roloc Durable Edge Disc 984F, 80+, YF-weight, TSM, Maroon, 4 in, Die RS400BBM, 7000119220, 100 per case
3M 11824, Disc Pad Hub, GL Quick Change, 2-1/2 in 5/8-11 Internal, 7000120408
Standard Abrasives 705686, A/O Straight Cartridge Roll, 1/4 in x 1-1/2 in x 1/8 in 80, 7100080009
3M 37024, Extra Large Drywall Sanding Sponge 910-DDA, Dual Angle, 2-1/2 in x 8 in x 1 in, Fine, 7010375249 