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?).

Insize 4120-14, METRIC THREAD RING GAGE, GO, M14x2, 6928640341489
3M 64318, Cubitron II Depressed Center Grinding Wheel, Quick Change, Type 27, 6 in x 1/4 in x 5/8"-11, 7100103318, 20 per case
Dynabrade 78754 1" x 2-3/4"-A3 Dynacut Z/A Mounted Point, 5/pack
Dynabrade 11518 Rubber Drive Wheel
3M 26151, PPS Series 2.0 H/O Midi/Mini Lid, 200u Micron Filter, 25 lids per pack, 7100200473
Dynabrade 78055 1" W x 24" L Medium NWN DynaBrite Belt, 10/pack 