Apex Tool JCM6309 Jacobs 36 IND CHUCK 3JT MOUNT 6309 & K4 KEY

36-3 Plain Bearing Heavy Duty 3/4" 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.