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
Insize 0010-A35, SOUND LEVEL METER, 35dB~130dB, 6974029777004
3M 05027, Utility Cloth Roll 211K, 150 J-weight, 1-1/2 in x 50 yd, Full-flex, 7100031693
Standard Abrasives 714179, Aluminum Oxide Handy Roll, P240 J-weight, 1-1/2 in x 50 yd, 7100050575
Dynabrade 94960 1/4" Composite-Style Coupler, 1/4" Female
Dynabrade 95674 1/4" Female Coupler
3M 26102, PPS Series 2.0 Adapter, Type S16, 3/8 Female, 19 Thread BSP, 7100135934
Dynabrade 98273 - 1/2" Female Coupler with 1/2" Male Plug Assembly
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 