The machine has light-weight, simple structure, operate facility, auto stop when bump objective into pieces. It is suitable for drilling in mine, mining the soft ore; diging pole and feet-hole, karating water-ditch; or crashing concrete and clay in construction work; or working in the situation that need producing the i***ct in the mechanical industry such as assemble and unassemble the cincture pin in tractor, panzer and so on. Specification: Weigh 7.2kg Rammar dia 35mm Rammar stroke 120mm Rammar weigh 0.6kg Work air pressure 0.4~0.49***
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