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 97421, Aluminum Foil Tape 3380, Silver, 72 mm x 45 m, 3.25 mil, 7010375681
3M 01322, Stikit Gold Film Disc Roll, 6 in, P500 grade, 7010327903, 75 discs per roll
3M 52755, Cool Flow Exhalation Valve 7583, System Component, 7000002159, 10 ea/Bag
3M 29837, Sanding Screen, 180 Grit, 17 in x NH, 7100160762
Dynabrade 95677 1/4" Male Plug with 1/4" NPT Female Thread
3M 03123, Pro Grade Precision Edge Detailing Dual Angle Sanding Sponge, 24302TRIP-XFDA, 2-7/8 in x 4.5 in x 1 in, X-Fine, 7100170066 