... (10 5/8”),295.3(11 5/8”)311.1(12 1/4”),346.0 (13 5/8”),349.2(13 ... (22”),609.6(24”)660.4(26”)3.Available models: Steel tooth(IADC)111, 121,131117,124,126,127,136,137 ... production technology ensuring the quality satisfy international request. API 12 1/4" IADC127 steel tooth tricone bit /rock bit with high quality