... Co,Ltd. Is one professional manufacturer / exporter of rock drilling tools and drilling rig in China.The products quality are strict according ... and hammer( DHD,COP,BR,SD,QL,Mission Shank), button bits, cross bits, chisel bits, coupling sleeve,casing tube ... barrel, single core barrel, reaming shell, diamond bit, , PDC bit,,hard alloy bit,drilling pipe , drilling rig, pick cutters, all steel cross bits, ...