... 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 good ... -1621Q9-1826QConcave face25.523ZRQ203G11-1621Q9-1826QFlat face30.224 ZRQ203G-A 6-1826Q9-1826QConcave face, Concentric Casing System With Ring Bits ZRTG140Outer ...