... sizes 3:ISO Certificated 4:Long service life DTH drill rods1,Top-hammer drilling tools including thread button bits ... COP, DHD, QL, MACH, MISSION, SD, XL shanks.Water DTH hammer, ODS system, etc3,Drag bits including Step and ... Chevron types with "API Reg", "NRod" thread.Claw tybe bits, Clay bits, ... , plate,coupling.), Rebar rock bolting, Friction bolting. etc. Drill rod