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1. The simple construction easy to maintain and has less failures.
2. The impact power is large; the effect of transmitting energy is good; the prnetration speed is high.
3. ALl parts have got special heat treatment, so the hardness and duability is goodm and the service life is long.
4. With double threads in chuck sleeve for connection, it is easy to joint and remove the bits.
5. Where the drill bit is lifted from hole bottom, it can automatically stop impacting and remove drilling cutting with large air volume at the same tiem.
6. Throng the agency of anti-water back device, it can finish drilling work on the conditions of large water-make in the blasting hole.
High efficientcy of removal drilling cuttings can be achieved by means of using central exhaut system, so rock cuttings repeating breakage can be also reduced.