BONET Watch Maker Lever Operated Self Centering Chuck is available in 3-Jaw (LOW-3). These chucks are manufactured out of high quality materials. The bodies are made of Alloyed STEEL. 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. These chucks are mainly used in watch making industry to grip small parts. Only one set of jaws is provided with each chuck which is reversible. There is thread in the bore for mounting the chuck.