1) Certified by ISO9001&API 2) Fast drilling rate 3) Strong cutting ... to the amount of your requirementCangzhou Great Drill Co., Ltd specializes in drill bits, tricone bits, pdc bits ... /8"to 26", cover most of IADC codes. Drill pipe, Mud pump and stabilizers for water well, oil ... filed, waterwell. Including tricone bits, PDC bits and drill pipe. Various of model and dimension available. Good condition ...