Top drive is a mechanical device on a drilling rig that provides clockwise torque to the drill string to drill a borehole. It has become one of the new technologies of the 1980's. Application of this seemingly old concept is now widespread in most offshore areas of the world. Top-drive drilling is one of the biggest changes made to the rotary-drilling method since the development of the rotary table so far.To use the top drive can reduce risk and increase safety while drilling in several ways. Topland focuses on main equipment system (TDS series) and its spares (Hydraulic cylinder, cam follower, sleeve, rotor brake, gear, switch, pumpetc) with the upgraded advantages on the higher horsepower which provide the significant improvements to performance, and ensures customers are receiving the excellent quality and experience of the cost-effective solution.