DTH hammer,DTH hammer bit,Down the hole bit,rock drill,rock drilling,overburden bits,Hammer,Drill bit,Hihg air pressure 6High air pressure DTH BitsDTH Bits seriesDrill BitBit Dia.(mm)NO.AirHolesGaugeButtonsFrontButtonsWeight(Kg)Part No.SUG65DHD360Cop64HD65 15228×φ168×φ1622.0SD152C6416528×φ188×φ1624.0SD165C6417828×φ188×φ1626.0SD178C6419039×φ189×φ1628.0SD190C64203210×φ1810×φ1629.5SD203C64SD615228×φ ...