Ball Bearing Chucks, K4, Jacobs 3JT Female

Features: 1-piece fluted sleeve construction | Ball trust bearing reduces friction in chuck closing mechansim | Through-hardened sleeve teeth, nose, and keyholes for wear resistance | Maximizes gripping force and drilling accuracy | Treated to ensure thread life and high gripping surface hardness | Jaws center-ground for absolute straightness and alignment | For heavy-duty, close tolerance production drilling | For production drilling equipment, jig borers, milling machines, lathes, and radials