... special feature that the structure is very compact, Less of the-easy-to-damage-parts, and very easy ... is a Kind hand held drill built up with gasoline engine, Air pump, rock drill and the rotation ... YN27C Rock Drillis is a very efficient machine, composed of gasoline engine, Air pump, rock drill. It adapt to ... carried at any time and in any area. Features of YN27C 1. Easy to operate, just turn the ...