... 117 215 216 217 315 316 317 325 327PDC BIT(3 blades,4 blades,5 blades,6 blades)5 1/2, 6 ... /27 7/8,8 1/2,8 3/410 5/8,12 1/413 3/4, 17 1/2,22, 24,26M223, ... M322,M316,M222,M416,M122List of Rock BitsStructureI you need more information,please feel free ... contact to me. 4 3/8''2012 oil well drilling bits prices