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?).

3M 26120, PPS Series 2.0 Adapter, Type S28, 17.5 mm Female, 19 TPI
Thread, 7100135956
Insize 6313-1D8, SETTING RING, 1.8" dia, 6928640357756
3M 83978, Hookit Marine Fairing Board, Flexible, 4 1/2 in x 30 in, 7000045685
Standard Abrasives 709966, A/O Tapered Cone Point, B-20 180, 7010368591, 100 per case
3M 27702, Cubitron II Roloc Durable Edge Disc 984F, 36+, YF-weight, TR, Maroon, 3 in, Die R300V, 7000045167, 200 per case
3M 35827, Hookit Dust Extraction Flexible Sanding Block, 273 mm x 67 mm, 7100256623
Dynabrade 01825 Bearing
3M 26105, PPS Series 2.0 Adapter, Type S21, 14 mm Female, 1.0 mm
Thread, 7100135829
3M 92250, Extra Large Single Angle Sanding Sponge 910PSA-12-CC, 2-7/8 in x 8 in x 1 in Fine, 7100101547 