BONET Self Centering Chucks are available in both Standard Bore (STC) as well as in Big Bore (BBC). These chucks are available in 3-Jaw (STC-3), 4-Jaw (STC-4) and 6-Jaw (STC-6) configuration. These 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. One set of Reverse Jaws, Mounting Bolts, Operating Key and an Inspection Report is provided with each chuck. STEEL BODY Chucks are also available.