... carbide bit, also suitable forengineering geology drilling, hydrogeology drilling, water welldrilling and large dia. pile hole drilling. It has features ofreasonable arrangement, ... , light weight, big capability,wide performance and good exchangability etc. Drilling depth (m)1000Spindle speeds (r/min) forward87; 160; 230; ... XY-1000powerful light-weight small spindle type wide used core drilling rig