Caing Tube OD 133mm MRE Dual Rotors Overburden Casing Drilling Bit DHD340 Shank For Soft Hard Rockformation

203mm MISSION Shank 8 Inch Down The Hole High Air Pressure DTH Button Bits For Hard Rock Formation

305mm HM8 Shank 8 Inch Down The Hole High Air Pressure DTH Drill Button Bits For Pneumatic Drill Machine

110mm QL40 Shank 4 Inch Dow The Hole DTH Hammer Drill Button Bits For Tunneling

105mm 3 Inch QL30 Shank Down The Hole DTH Drill Bit For Mining Construction

90mm DHD25 Shank Down The Hole DTH Drill Bit For Construction Water Well Drilling

76mm DHD25 Shank Down The Hole DTH Drill Bit For Quarry Mining Well Drilling