... bit 2.material:hadifield steel 3.colour:blue 4:steel tooth bits 5.high quality Advantage of our products:1.stocks ... structureTooth face, back cone hardfaced strengthening,back cone is inserted (tooth)Formation of applicationSoft to medium soft or In the soft ... bits, drill bits, TCI bits,drilling bits, oilfield bits, steel tooth bits,drag bits, hammer bits, well bits and so on ...