... IADC 447-837 API Kingdream Brand New Rolling bearing steel tooth rock rock bits 1.Introduction about us: ... bits, single cone bits, steel tooth bits, insert tooth bits, roller bits, drill bits, drilling tools etc. we have been ... the near future. 2. TCI bits series 1.Tungsten carbide insert bit of high strength and toughness is ... ”),558(22”),609.6(24”)660.4(26”) Steel tooth(IADC)111, 121,131117,124,126,127, ...