... Zhongrui can manufacturer the best quality DTH drill bit, DTH hammer and chisel bit, thread button bit. Now we can supply ... 90mm-254mm(3.5"-10") DTH hammer, 340,350,360,380, COP44, COP54, COP64, COP84 , 3"-8 ... ,350,360,380 4",5",6",8" quick hammer with very good price and service. No.ModelOutside diameterLength (without ... (at 1.7Mpa)15-34API(4 1/2)" REG195-254 Air dth drill hammer