... by ISO9001&API 2))used for water well, oil field 3)multiple gauge protection steel tooth tricone bit,steel tooth bit ... bit, rock bit,steel tooth tricone bit1.Sizes range from 3 7/8" to 26" , normal sizes consist of 5 ... 1/2", 9 5/8", 9 7/8", 12 1/4",13 5/8", 14 3/4", 15 1/2", 16", 17 ... /2",22", 26", etc. .2.Covers almost all IADC codes .3. Steel tooth bits is always rubber O-ring sealed bearing ...