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?).

Dynabrade 90292 1/2" W x 18" L Medium NWN DynaBrite Premium Belts, 10/pack
Dynabrade 95842 Dynabrade Air Lube 10W/NR, 1 Pint
Insize 4112-BD35, INDIVIDUAL STEEL GAGE BLOCK, .35", grade AS-1, 6928640353413
Dynabrade 79808 DynaBolt AO 4" x .035" x 3/8" T1 Cut-off Wheel, Box of 10 Discs
3M 03123, Pro Grade Precision Edge Detailing Dual Angle Sanding Sponge, 24302TRIP-XFDA, 2-7/8 in x 4.5 in x 1 in, X-Fine, 7100170066 