... :hadifield steel 3.colour:blue 4:steel tooth bits 5.high quality Advantage of our ... back cone hardfaced strengthening,back cone is inserted (tooth)Formation of applicationSoft to medium soft or In ... bits, TCI bits,drilling bits, oilfield bits, steel tooth bits,drag bits, hammer bits, well bits and ... as our tenet. Customers' needs are our first priority and customer satisfaction is the bottom line ...