Made up mainly of tungsten carbide (WC) fragments adhered with a metal binder, such as cobalt, cemented carbide combines the strength of tungsten with the strength of other steels. The make-up of cemented carbides can be customized to fit specific applications, leading to the production of varieties like YG15, yg20, http://king-wifi.win//index.php?title=penningtonmcpherson7796