BONET Crankshaft Grinder Chucks are available in 3-Jaw (CRC-3). 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. STEEL BODY Chucks are also available. The Gripping portion of Jaws have serrations which provide RIGID GRIP. The rod of Operating Key is longer which provide more gripping force. One set of Reverse Jaws, Operating Key, Mounting Bolts & Inspection Report is provided with each chuck.