... the small gasoline engine and used for drilling on the hard rock or rock with medium hardness. Because it is self-powered, it ... the independent impact function. It can be used for cleaving rock, bruising the concrete foundation, tamping the railroad bed, small area ... :Moil point, wide chisel, narrow chisel: used for breaking; Splinting rock tool: used for cleaving rocks; Spade: used for excavating the ...