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H.H. Drill-Tech Drilling Machinery Co., Ltd., is a large-scale leading enterprise, specially devoted to manufacturing geological exploration drilling rig and underground drilling machine. The factory makes four main series of products consisting of more than 40 kinds of drilling machine tools. The main products include XY-series core drills, which are applied in solid mine bed exploration drilling with the depth of 100-2200 meters, engineering geological exploration, superficial-zone petroleum and natural gas mining, mines’ gallery ventilation and water discharge tunnel drilling; GQ-series engineering drills, which are suitable for 0.8-3 meters diameter hole foundation stakes, located in complicated layers and hard layers, for bridge, road tall buildings construction; FDP-series hydraulic directional drilling rigs, which are mainly used in the construction of underground pipe systems; and hydraulic rotary rigs. Lianyungang Huanghai Machinery is one of the leading manufacturers of geological exploration core drilling rigs for medium-depth hole drilling. In the main products, one of them is awarded a National Silver Medal, three of them are awarded the prize of National Inovated Product and four of them are in the leading position in China.