... no water and no electronic power. It is a Kind hand held drill built up with gasoline ... running or stop. It can be used as a tool for breaking, percussive drilling, tamping besides rock. Other ... coal Instruction of YN27C YN27C Rock Drillis is a very efficient machine, composed of gasoline engine, Air ... without water and electronic power. Meanwhile it is a hand- held drill, during operation, rock power ...