Dual-wall Drilling Rods (also called RC Drill Rods)comprises and outer and inner pipe with a sealing system to keep the drill string pressurized. Air is blown between the walls of the inner and outer pipes down to the hammer while the air forces the cuttings back up through the center of the inner piper.
Price: RMB
Product Description
PDC Anchor-shank Drill Bits are mainly used to drill the roof and side supporting hole,
the gas drainage, water infusion, geological exploration hole and grouting hole and so on for the
coal mine seam, water conservancy and hydropower, dam and roadway construction of mesh support. The life of these bits is 10-30 times of alloy bits
