Apex Tool JCM6232 Jacobs 3B 5/8 PB CHUCK & K3 KEY

3B-5/8" Plain Bearing Heavy Duty 5/8" Chuck. Jaws Center-Ground for Absolute Straightness and Alignment. One-Piece Sleeve Eliminates Crack Between Driving Teeth Often Found in Other Designs. Through-Hardened Sleeve Teeth, Plus Hardened Nose and Keyholes Provide Outstanding Wear Resistance. Each Chuck 100% Inspected for Performance and Precision. T.I.R. .004" Maximum at Half Capacity.