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 1120-2001WL, DIGITAL INSIDE GROOVE CALIPER, 1.57-8"/40-200mm, built-in wireless, 6928640384820
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Dynabrade 79058 1/4" W x 24" L 80 Grit A/Z DynaCut Belt, 50/pack
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3M 93949, General Purpose Sanding Sponge CP040-3PK, Single Angle, 2-7/8 in x 4-7/8 in x 1 in, Fine, 7100175194, 3/pack 