... due to the special innerstructure of GM series DTH hammer designed according to newest rock drilling theory.2. ... 30,Mission40,Mission50/55,Mission 60,Mission 60W.Mission 65,Mission 85Mission SD4,Mission SD5,Mission SD6,Mission SD8QL40 ... ,QL50,QL60,QL80CIR65,CIR80,CIR90,CIR110COPROD89,COPROD102,COPROD127 Hammer typeBitsFace designAPI threadDiameterWork pressureG24(2")76/80mmFlat/Concave/ConvexF42 ...