ST-100 core drilling machine is a light type core drill rig at high speed with hydraulic feeding. 1.With hydraulic feeding device, elevated drilling efficiency, reduced labor strength. 2.The rig is equipped with an upper spherical jaw holding mechanism and hexagonal Kelly, which can be replaced without shutdown, high efficiency, safe and reliable. 3.A hole bottom pressure gauge is mounted indicating the pressure in order to control the status inside the hole. 4.Compact structure, small volume, lightweight, high detachability, easy transportation and suitable for the operations in plains or mountain areas.