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 15938 Scotch-Brite Surface Conditioning Low Stretch Belt, SC-BL, A/O Medium, 1-1/2 in x 60 in, 7010300824
3M 00581 Scotch-Brite Surface Conditioning Belt, SC-BS, A/O Medium, 2-1/2 in x 60 in, 7010329198
3M 45020, Diamond Grade DG3 Reflective Digital Sheeting 4081UDS, Fluorescent Yellow, 30 in x 50 yd, 1 Roll/Case, 7100282390
Dynabrade 78127 3" Dia. Medium NWN VT DynaBrite Locking-Type Disc, 25/pack
3M 65087, Scotch-Brite Diamond Wheel, 3" x 1/2" x 3/8" 645DC, 7100083803
3M 64324, Foil Tape 3340, Silver, 72 mm x 45.7 m, 3.9 mil, 7010335734
3M 85314, Aluminum Foil Tape 425, Silver, 19 mm x 55 m, 4.6 mil, 7100053636
3M 33443, Cubitron II File Belt, 36+, 1/2 in x 18 in (12.7 mm x 457.2 mm), 7100033184, 10 belts per carton, 5 cartons per case
3M 33439, Cubitron II File Belt, 33439, 60+, 10 mm x 330 mm (3/8 in x 13 in), 7100033194, 10 belts per carton, 5 cartons per case
Dynabrade 92206 1/8" W x 12" L 80 Grit A/O DynaCut Belt , 50/pack
3M 07053, General Purpose Sanding Sponge CP-040NA, Single Angle, 2-7/8 in x 4-7/8 in x 1 in, Fine, 7100110752 