... :hadifield steel 3.colour:blue 4:steel tooth bits 5.high quality Advantage of our ... good after-sales service4.long work life5.Cutter's quality performance is good ,6.Strong resistance ... 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 ...