MAXDRILL ROCK DRILLING TOOLS: --Integral drill rod (HEX.19MM, HEX.22MM) , Plug drill rod (shank hex19mm hex.22mm) --Taper drill rod(hex.19mm, ... hex.22mm) Taper connected bit(chisel bit, cross bit, button bit ) --Extension drilling tools : ... R25, R32L,R32N,R32S, R38N,R51L,R51N,T76N,T76S) -Self-drilling rock bolt accessories: (coupling, nut, plate, steel bit, cross ...