The Internal Combustion Rock Drill Type YN27J is a very efficient machine with the characters that The structure is very compact, Less of the-easy-to-damage-parts, and very easy to control. It can adapt to these outside situations there is no water and no electronic power. It is a Kind hand held drill built up with gasoline engine, Air pump, rock drill and the rotation plumbum equipment for running or stop. It can be used as a tool for breaking, percussive drilling, tamping besides rock Drilling.
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