... system, etc3,Drag bits including Step and Chevron types with "API Reg", "NRod" thread.Claw tybe bits, Clay bits,etc4,Diamond ... ,WG,etc), reaming shell, core barrel and drill rods.etc.5,Rock anchor tools, IBO anchor system( anchor rods, anchor bits ... , plate,coupling.), Rebar rock bolting, Friction bolting. etc. DTH Drilling pipe