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 63738, Contractor Grade Multi-Use Duct Tape 2979, Silver, 1.88 in x 60 yd, 7010335692
3M 22392, Roloc Disc 361F, 24 YF-weight, TR, 3 in, Die R300V, 7000045090
Insize 7341-1S, PIN GAGE HANDLE (with 1pc handle and 7 pairs of collecting bushes), .040-.075", 6928640360688
3M 9145, Disc Pad Holder, 4-1/2 in x 1/8 in x 3/8 in 5/8-11 Internal, 7000046035
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
3M 19770, Utility Cloth Sheet 314D, 9 in x 11 in P120 J-weight, 7000000358
Dynabrade 78591 3/8" Dia. x 1" W x 1/8" Center Hole, 80 Grit, 100/pack
3M 26016, PPS Series 2.0 Adapter, Type S9, 16 mm Male, 1.5 mm Thread, 7100135330
3M 28765, Cubitron II Cut and Grind Wheel, T27 Quick Change, 7 in x 1/8 in x 5/8-11 in, 7100019074, 20 per case
Dynabrade 91427 1/4" W x 12" L 120 Grit A/O DynaCut Belt, 50/pack
3M 26110, PPS Series 2.0 Adapter, Type S24, 1/4 Female, R-Angle 18
Thread NPS, Side Cup Mount, 7100135940 