Hejian Huanyu Petroleum Machinery Co., Ltd. is specialized in tricone rock bits, TCI tricone bit,milled tooth tricone bit ,steel tooth tricone bit ,reamer bit ,down hole opener ,single cone rock bits, PDC drill bits, PDC core bits, PDC oil drill bits, diamond core bit,core drill bit ,bicenter bit ,drill rigs & machines, drill pipes & rods, steel pipes, seamless steel pipes and other related petroleum products. Whatever drilling tools you need, we can supply them. We also can produce them according to your special needs.