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 27310, Ultra Durable 5 inch Power Sanding Discs, Universal Hole, 120 grit, 7100187646, 10 per pack
3M 5677, DISC PAD HOLDER 914, 4 IN X 1/8 IN X 3/8 IN M14-2.0 INTERNAL, 7010299278
Dynabrade 52835 1/4" Drill, .4 HP, Rear Exhaust, 5,500 RPM
Standard Abrasives 708357, A/O Full Taper Cartridge Roll, 3/8 in x 1 in x 1/8 in 80, 7100085868
Dynabrade 60206 - 3,000 lb. Jack with 1/2" Vi-Sorb Pad
3M 26024, PPS Series 2.0 Spray Cup System Kit, Large (28 fl oz, 850mL), 200 Micron Filter, 7100134650
Dynabrade 95396 [1" Thread - 1" Non-Thread], Non-Conductive Vacuum Hose Cuff 