... drill bit, DTH hammer. Now we can supply 90mm-254mm(3.5"-10") DTH rock drill bit, 340,350,360,380, COP44 ... , COP54, COP64, COP84 , 3"-8" DTH hammer, 340,350,360,380 4",5",6",8" quick hammer with very ... . of ring bitOuter dia. of pilot bitMatch hammerWeight(kg)183mm163mm188mm140mm160mmZRC130G60.3 The most popular rock drill bit