HARGRAND provided a whole set of drilling tools which include Diamond Bits, PDC Bits, T.C bits, Casing Shoes, Reamers, Core Barrel Assembly and Accessories, Drill Rods, Casing and other drilling tools. All these products are mating with Chinese standard(P75, P91, P110, S59, S75, S95), "Q" series standard ( BQ, NQ, HQ, PQ), and special standard(base on customers' requitements).