... 3"~26" 2.ISO&API 3.high quality, best price 4.cover all IADC code 1 Specifications: Size8 1/2”(215 ... 0 (13 5/8”),349.2(13 3/4”)374.6(14 3/4”)381(15”),393.7(15 1/2”),406 ... 1/2”),508(20”),558(22”),609.6(24”)660.4(26”)3.Available models: Steel tooth(IADC)111, 121,131117 ... technology ensuring the quality satisfy international request. API 12 1/4" IADC127 steel tooth drilling bit /rock bit with high quality