Steel Tooth Tricone Bits 1)certified by ISO9001&API 2))used for water well, oil field 3)multiple gauge ... /8" to 26" , normal sizes consist of 5 7/8", 6", 6 1/2", 7 1/2", 8 1/2", 9 1/2", 9 5/8 ... ", 9 7/8", 12 1/4",13 5/8", 14 3/4", 15 ... tools which will decrease the cost of project. 3 7/8''Steel Tooth Bit