AIR, POWER & HAND TOOLS. Thank you for shopping with us! 5C Mount 4" 3-Jaw Lathe Chuck Outside Diameter Clamp Range is 0.079-3.150" Inside Diameter Jam Range is 1.181-3.543" Hole Through 5C Adapter is 0.75" Hole Through Chuck is 0.866 T. 5C adapter with standard internal and external threads. Quick set up in fixtures and 5C spindles. Chuck jaws are self centering, scroll type. 2 Sets of solid steel jaws, both internal and external.