DTH hammer,DTH hammer bit,Down the hole bit,rock drill,rock drilling,overburden bits,Hammer,Drill bit,Hihg air pressure 8High air pressure DTH BitsDTH Bits seriesDrill BitBit Dia.(mm)NO.AirHolesGaugeButtonsFrontButtonsWeight(Kg)Part No.SUG85DHD380Cop84HD85 19539×φ189×φ1834.0SD195C84203210×φ1810×φ1836.0SD203C84216312×φ1812×φ1845.0SD216C84254312×φ1820×φ1858.0SD254C84305412×φ1830×φ1875. ...