... or ramming. The machine is suited to build of bridge, road, power station, geological explortation etc.Technical parameters of YN27J ... combustion YN27C drill/ pionjar rock drill/ hand held gas jack hammer/YN27J GAS POWERED BREAKERS/rock drill Rock Drill TypeYN27JWeight (kg)27Overall dimension ... m)6Shank size (mm)Hex 22x108Ignition systemControllable silicon,contactless system GAS POWERED BREAKERS