... water well, oil field 3)multiple gauge protection steel tooth tricone bit,steel tooth bit Fast drilling speed. Long working life ... Milled tooth bit),Tricone bit, rock bit,steel tooth tricone bit1.Sizes range from 3 7/8" to 26" , normal sizes ... 1/2", 9 1/2", 9 5/8", 9 7/8", 12 1/4",13 5/8", 14 3/4 ... 26", etc. .2.Covers almost all IADC codes .3. Steel tooth bits is always rubber O-ring sealed bearing or ...