Steelex D3608 5-Inch 3-Jaw Chuck 5 inch; 3-jaw; plain back Inside jaw minimum/maximum jaw openings are .100 to 1.575 inches / 1.496 to 4.921 inches Outside jaw minimum/maximum openings are 1.496 to 4.331 inches Outside jaw minimum/maximum openings are 1.496 to 4.331 inches Precision ground components