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 78728 1/8" x 3/8"-B97 Dynacut A/O Mounted Point, Vitrified, 5/pack
Dynabrade 78733 7/8" x 2"-A11 Dynacut A/O Mounted Point, Vitrified, 5/pack
Dynabrade 92727 1" W x 150' L 3 Micron A/O Lapping Film DynaCut Roll
3M 16299, PPS Lid Dispenser: Large, Standard, or Midi, 7100042072
Dynabrade 98638 Button Hd Cap Screw 3/8-16 x 1/2"
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 