Cangzhou Great Drill Bits Co. Ltd., founded in 2010, speciallized in processing research of steel and diamond materials, is involved in the R&D, design, production and sales of petroleum equipment, up to now we have being the top material supplier of CNPC, SINOPEC, CNOOC.We have a 40,000 m2 of production based in Hebei Hejian provincial development zone, and several international advanced production lines featured in turning-milling compound, five-axis linkage, special for high-performance