DTH hammer 1.Fast drilling speed, low air consumption 2. Straightness and hole quality 3. High penetration rate DTH hammerWith year of experience, Zhongrui can produce the best quality dth hammer, dth bit in China, Now we can supply 3"-8" hammer and 4"-8" quick hammer. Due to the high drilling rate and long service life, now Zhongrui DTH hammer, DTH bits are using more and more, their suceessful ...