6-Jaw, Self-Centering, Plain Back, Scroll Lathe Chuck Chucks set to "zero" with use of fine adjustment screws. 0.0005" TIR repeatability on duplicate parts. Scroll and jaws made of high alloy steel. 2-piece reversible jaws are hardened and precision ground. Features include... 8" Chuck Diameter 2.264" Thru Hole 1 set of two-piece hardened reversible jaws 1 chuck wrench 1 set of mounting screws