Our company can provides Soil Drilling Rock Drilling ,Diaphragm Wall Drilling,Cased Drilling and Soft Soil Drilling,Hard Rock Drilling Roller Bits(We has the ability to manufacture and supply 8½" (215.9mm) and 12 1/4" (311mm) roller bits for hard rock drilling. Moreoever, we can also supply used roller bits in good condition if requested by the customer.),Spare parts of Rotary Drilling Rig (Mechanical and Electrical parts),we also provides spare parts such as swivel head, pulley, rotary fulcrum bearing, motor, reducer, pole spring, rotary driver spring, unlock frame, forcing stroke, expansion cylinder, electric element.