... can manufacturer the best quality DTH drill bit, DTH drill hammer and chisel bit, thread button bit. Now we can supply 90mm ... ,350,360,380, COP44, COP54, COP64, COP84 , 3"-8" DTH hammer, 340,350,360,380 4",5",6",8" quick ... hammer with very good price and service. No.ModelOutside diameterLength (without ...