Shop Fox D3609 6-Inch 3-Jaw Self-Centering Chuck 6 inch; 3-jaw; plain back Inside jaw minimum/maximum jaw openings are .118 to 2.165 inches / 1.969 to 6.299 inches Outside jaw minimum/maximum openings are 1.575 to 5.708 inches Outside jaw minimum/maximum openings are 1.575 to 5.708 inches Precision ground components