Shanghai Rock-drilling Machinery Equipment Co., Ltd is a private high-tech enterprise possessing a experienced technical team in R&D and manufacturing of high-tech products. YT27A and YT28A-93 Type Pusher air leg rock drill developed and manufactured by the Company are national patented products and features powerful impact force, high efficiency, and stable performance compared to similar products. It is testified by long-term mining practice that the machine enjoys great popularity of the users for its strong points such as rapid drilling speed, light weight, low noise, etc. Widely used in the rock-drilling work of engineering of mine, energy, transportation, national defense, water conservancy and hydroelectricity, the machine has already reached the leading international level.