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 26000, PPS Series 2.0 Spray Cup System Kit, Standard (22 fl oz, 650mL), 200u Micron Filter, 7100135954
3M 22405, Roloc Disc 361F, P100 YF-weight, TR, 3 in, Die R300V, 7000045102
3M 60895, Impact Stripping Tape 500, Green, 2 in x 10 yd, 36 mil, 6 Rolls/Case, 7000001171
Standard Abrasives 78512, Ceramic Pro Type 27 Flap Disc, 645109, 4-1/2 in x 7/8 40 Y-weight, 7010301276
3M 06512, Scotch Steel Gray Masking Paper, 06512, 12 in x 1000 ft, 3 per case, 7010327747
3M 27490, 641WY, 3" X 30", 1200 Mesh, Diamond Cloth Belts, 7010508907
3M 27008, 642WY, 3" X 30", 50000 Mesh, Diamond Cloth Belts, 7010533172
3M 15145 Scotch-Brite Surface Conditioning Low Stretch Belt, SC-BL, A/O Medium, 1 in x 132 in, 7010364529
3M 09092, Dry Layup Adhesive 1.0, 18.93 Liter, Red, 7000044933
Dynabrade 14010 Dynafile Abrasive Belt Tool Versatility Kit
3M 22395, Roloc Disc 361F, 60 YF-weight, TR, 3 in, Die R300V, 7000045098
Dynabrade 15420 Dynafile III Abrasive Belt Tool
3M 92250, Extra Large Single Angle Sanding Sponge 910PSA-12-CC, 2-7/8 in x 8 in x 1 in Fine, 7100101547 