ZITHER Master Grip Self Centering Chucks have Master Hard Base, one set of Reversible hard jaw and one set of soft jaws. Operating key and Mounting Bolts, and Inspection report is provided with each chuck. These chucks are available in 2-Jaw (MGC-2), 3-Jaw (MGC-3), 4-Jaw (MGC-4) and 6-Jaw (MGC-6) configuration. These Zither chucks are manufactured out of high quality materials. The bodies are made of alloyed high strength cast iron. All other parts are made of special steels which are properly tested chemically and physically before use. These parts are then suitably heat treated and pass through stringent quality control tests, which ensure long service life. STEEL BODY Chucks are also available.