Add this 4 jaw chuck to your 4th axis as an upgrade to replace the included spur drive on the 4th axis unit. 

Perfect for bowl turning, the jaws of this chuck grip round stock as well as expand within a recess turned in the back of the workpiece. Twist adjustment moves jaws concentrically from 2" to 2-3/4" O.D. Chuck wrenches included.

Specifications:

Size: 3/4"
TPI: 16