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?).

3M 55694, Stikit Film Disc w/Tab 375L, P180, 5 in x NH, Die 500X, 7100106554, 250 per case
Dynabrade 78318 2" Dia. x 1" W x 1/4" Shank, Very Fine, NWN DynaBrite Wheel, 10/pack
3M 91004, Drywall Sanding Sponge CP-042-4PK, Single Angle, 4-7/8 in x 2-7/8 in x 1 in, Fine, 7100111452, 4/pack 
