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?).

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3M 16115, PPS Cup & Collar, Mini, 7000028417, 2 per carton
Dynabrade 95821 Dynabrade Air Lube 10W/NR, 4oz Bottle
3M 463-000-TRI-4, Pro Grade Precision Comfort & Performance Large Sanding Tool, 3.7 in x 7 in, 7010416697
Dynabrade 11476 Dynabelter Abrasive Belt Tool, Heavy-Duty
Dynabrade 77773 5" Dia. x 7/8" Center Hole, 60 Grit, Type 27, Ceramic DynaCut Flap Disc, 10/pack 