Medium Duty Plain Bearing Chucks, K30, Threaded 3/8-24

Features: Fluted sleeve standard on all models except 6200, 6206, 6204, 6208, 31138, which are smooth and ground | Jaws center-ground for absolute straightness and alignment | Jaws specially treated to ensure extended thread life and high gripping surface hardness | One-piece sleeve eliminates crack between driving teeth often found in other designs | Through-hardened sleeve teeth, nose, and keyholes for wear resistance | For portable, bench, or floor mounted power tools