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 ISF-DF10KA, DIGITAL FORCE GAGE (HIGH RESOLUTION), 2250lbf, 6928640326059
Dynabrade 51301 .5 hp Straight-Line Die Grinder
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Dynabrade 95886 Washers For Vacuum Shroud (57737)
3M 91004, Drywall Sanding Sponge CP-042-4PK, Single Angle, 4-7/8 in x 2-7/8 in x 1 in, Fine, 7100111452, 4/pack 