Jacobs 32288C 41BA-3/8 Chuck 0.04-Inch~0.375- Inch Capacity Medium Duty Plain Bearing Keyed Chuck Smooth Sleeve With 3/8-Inch 24 Threaded Mount T.I.R. 0.014-Inch maximum at half capacity 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-Percent inspected for performance and precision