... IADC 447-837 API Kingdream Brand New Rolling bearing steel tooth rock rock bits 1.Introduction about us: ... TCI bits, rock bits, tricone bits, single cone bits, steel tooth bits, insert tooth bits, roller bits, drill bits, ... the near future. 2. TCI bits series 1.Tungsten carbide insert bit of high strength and toughness is ... 20”),558(22”),609.6(24”)660.4(26”) Steel tooth(IADC)111, 121,131117,124,126,127, ...