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 92034 1-1/2" Dia. x 1-1/2" W, 60 Grit, Z/A DynaCut Band, 10/pack
Dynabrade 95848 Dynabrade Gear Oil
3M 71512, Cloth Belt 340D, 50 X-weight, 3 in x 18 in, Fabri-lok, Single-flex, 7010294780, 25 per case
3M 86745, Diamond Disc, 2" Roloc, 674W, 120 Mesh, TR, 7100022116, Box of 10
Insize 1120-2001, DIGITAL INSIDE GROOVE CALIPER, 1.57-8"/40-200mm, 6928640384813
3M 81356, Venture Tape White Aluminum Foil Tape 1558HT, 72 mm a 45.7 m, 5.4 mil, 7010335933
3M 34425, General Purpose Sanding Sponge CP041-3PK, Single Angle, 2-7/8 in x 4-7/8 in x 1 in, Medium, 7100175218, 3/pack 