... 3.Meet with API Spec7-1 Standard tricone bit, TCI bit, drilling cone bit, rotary bit, single cone bit1.Cutting StructureIn response ... bigger, so it can receive higher WOB and high reliability. 4.Hydraulic DesignSmall angled watercourse design increased the shirttail thickness and ... . 6.Current Main AvailabilitySize Bit TypeIn.mm4 1/8104.8517,527,537,617 4 1/2114.3517,527,537,6174 5/8117.5517 ...