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 4168-21E, STEEL STANDARD BALLS, 23/32", 6940561981599
Dynabrade 51301 .5 hp Straight-Line Die Grinder
Dynabrade 91315 11-1/4" Dia. x 36 Grit A/O Non-Vacuum Hook-Face DynaCut Disc, 10/Box
3M 11411, Roloc Disc 361F, 50 YF-weight, TR, 1 in, Die R100N, 7000045095
Dynabrade 64404 36" W x 60" L (914 mm W x 1,524 mm L) Metal Capture Downdraft Table, 230 V (AC), Side Exhaust
Dynabrade 54705 Rotor/Vane Set
Air Turbine Tools 310RXSV - 1/4" Router Hand Tool Series, 25,000RPM, 43420
Dynabrade 07107 Vane Set (5pk)
3M 07053, General Purpose Sanding Sponge CP040-12-CC, Single Angle, 2-7/8 in x 4-7/8 in x 1 in, Fine, 7100101245 