Internal Thread: M16 x 20
External Thread: 3/8″ – 24
Maximum Wheel Size: 3″
Overall Length: 13/16″
Uses Wrench: 31-328-7/8″
**Adapter for metric Collet Bodys. Used on Chicago pneumatic #860, Rockwell 2230
Also U.P.I #760 or 5762 and rockford AGR 250