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 26138, PPS Series 2.0 Adapter, Type S42, 3/8 Female R-Angle, 19Thread BSP, 7100135930
Insize 7332, SPINDLE LIFT KNOB, 6928640312649
3M 13085, Wetordry Cloth Disc 281W, 8 in x NH, P, 7000045611
3M 11411, Roloc Disc 361F, 50 YF-weight, TR, 1 in, Die R100N, 7000045095
3M 47088, Cubitron II Stikit Film Disc 775L, 240+, 6 in x NH, Linered w/Tab, Die 600Z, 7100145372, 250 per case
Dynabrade 78292 2" Dia. x 6A M Medium Type R Unitized Locking-Type Disc, 25/pack
3M 07054, General Purpose Sanding Sponge CP-041-ESF, Single Angle, 2-7/8 in x 4-7/8 in x 1 in, Medium, 7100101551 