TDD，born for drilling. TDD have been focusing on DTH drilling more than 20 years.TDD is a professional drilling tools & drill machinery manufacturer in China, and it enjoys an excellent business relationship with our customers around the world. TDD is awarded national patents on many inventions, and it has rich experience on many drilling construction sites. During the past 20 years, many customers are satisfied with our quality products for reasonable prices and professional trading services.We specialize in an extensive range of drilling tools & drill machinery, and we are supported by a highly professional and dedicated team respectively in the office and manufacturing base. If you have any questions or suggestions,please do not hesitate to contact with us.