PSI Woodworking CSC3000CTN Barracuda 2 Special Edition T/N, 12 Piece Lathe Chuck System Suitable for Mini, Midi and Full sized lathes Direct drive gear tooth jaw tightening "T" handle allows one-hand operation Features include an indexing accessory, a screw chuck, and a 5/8-inch super spur drive center insert Round stock can be held externally from 3/32-to-4-3/8-inch diameter. Bowls can be held by the outside rim up to a 5-inch diameter. Mounting holes can be held internally from 11/16-to-3-3/8-inch diameter