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 96106, Venture Tape Double Coated Nylon Tape 3693FLE, Right and Left Hand, 1.5 in x 60 yd, 7100043839
Insize 2345-E1, DIAL DEPTH GAGE WITH 60? BASE, 0-1", , 6928640378959
Dynabrade 95843 Dynabrade Air Lube 10W/NR, 1 Gallon
3M 07056, Drywall Sanding Sponge CP-042, Single Angle, 2-7/8 in x 4-7/8 in x 1 in, Fine, 7100101555 