Keyless Chucks for Standard to Medium Type Drills: All Steel Construction Ball bearing for superior holding, threaded and taper. Model Drill Cap., in. Mount Weight, oz. 520 0-3/8 3/8-24 Threaded 9 520 0-3/8 1/2-20 Threaded 9 520 0-3/8 2SH JT Taper 9 522 1/16-1/2 3/8-24 Threaded 14 522 1/16-1/2 1/2-2...