Hejian Ouman Drill Bits Co., Ltd. is located in hejian HeJian European man gentleman pavilion industrial development zone, 165 kilometers away from Beijing, the tianjin port in the east, the transportation is convenient. Mainly engaged in oil drilling diamond bit and special tools research and development, manufacturing and sales and technical services. Its main products are high-performance oil diamond bit and downhole drilling tools. Our company production of diamond bit, have been sold to domestic and international numerous fields, various models of the bit in the use of the superior performance, created the same bit new indicators, is fully recognized and praised by the users field. My company will serve you wholeheartedly, welcome you the presence!