DTH hammer SD4, QL40, Cop44, DHD340A

Size：4 inch DTH hammer Type： MD45/MSD4/MQL4 1.MD45 Length：1030mm, Weight：39.00kg, External Diameter:99mm Bit Shank: Cop44 DHD340A Connection Thread: API 2 3/8'' Reg Hole range: φ110-135 2.MSD4 Length：1084mm, Weight：40.50kg, External Diameter:99mm Bit Shank: SD4 Connection Thread: API 2 3/8'' Reg Hole range: φ110-135 3.MQL4 Length：1097mm, Weight：41.00kg, External Diameter:99mm Bit Shank: SD4 Connection Thread: API 2 3/8'' Reg Hole range: φ110-135 According to your request, the top sub can be made into two spanners, and put protection buttons. An air controlling hole can be drilled on the check valve to provide more efficient cutting discharge.