... bed, small area tamping. It is a small type of rock drill composed the power machine, working machine and air compress in ... traditional working method of rock drill, which was only used to drill blast holes. So it expands functions of rock drill.YN27T: It is one ... Moil point, wide chisel, narrow chisel: used for breaking;Splinting rock tool: used for cleaving rocks;Spade: used for excavating the frozen ...