We are one of largest manufacture in Asia, and we are specialized in PDC Drill Bits and Roller cone Bits. We are a suppliers of CNPC , Sinopec, CNOOC and famous customers from all around the word. 1.The manufacture is 40,000 square meters, and one of the biggest in the Asia. 2.Excellent design team, also provide OEM&ODM. 3.API, ISO Certification. 4.A part of research and development in Beijing. Welcome to contact me and visit our manufacture !!!