These chucks are available with 3 jaw, 4 jaws and 6 jaws and are refered as stc-3, stc-4 and stc-6 respectively. Stc-4 chucks are used when the job is square. Stc -6 chucks are used to grip jobs having thin walls as holding pressure is divided on six sides. One set of reverse jaws, mounting bolts, operating key and inspection report is provided with each chuck. True chuck size60mm 80mm100mm125mm160mm200mm230mm250mm270mm315mm400mm500mm600mm