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 97983, Hi-Strength 94 ET Adhesive, Clear, 5 Gallon Drum (Pail), 7100022993
3M 22586, Neoprene High Performance Contact Adhesive 1357, Light Yellow, 1 Gallon Can , 7000046325, 4/case
3M 97986, Hi-Strength 94 ET Cylinder Spray Adhesive, Red, Large Cylinder (Net Wt 26.2 lb), 7100018953
3M 35083, EMI Copper Foil Shielding Tape 1181, 1/4 in x 18 yd (6,35 mm x 16,5 m), 7000132168
3M 45022, Diamond Grade DG3 Reflective Digital Sheeting 4083UDS, Fluorescent Yellow Green, 36 in x 50 yd, 1 Roll/Case, 7100282393 