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 27254, Ultra Durable 5 inch Power Sanding Discs, Universal Hole, 60 grit, 7100188460, 5 per pack
Dynabrade 97567 1/4" Safety Coupler, Male
3M 33439, Cubitron II File Belt, 33439, 60+, 10 mm x 330 mm (3/8 in x 13 in), 7100033194, 10 belts per carton, 5 cartons per case
3M 99633, Scotch-Weld Pressure Fit/High Temperature Retaining Compound RT48, Green, 250 mL Bottle, 7100170130, 2/case
Dynabrade 53533 Cone or Plug Grinder (Triple Extension)
Standard Abrasives 875702, MD Mini-Brush, 4-1/2 in x 4 in x 5/8-11 FB036 A XCS Medium Density, 7010369376
3M 37024, Extra Large Drywall Sanding Sponge 910-DDA, Dual Angle, 2-1/2 in x 8 in x 1 in, Fine, 7010375249 