... machine tools and so on. We adopt numerical control process to all the accessory and apply it to the production line, especially in the ... & Coupling sleeve---R22,R25,R28,R32,R38,T38,T45,T51 Down-The-Hole Tools1) DTH BIT---65MM to 254mm.2) DTH Hammer---76MM ... ~2067bar)Plate ---Suitable for had rock ( more than 2067bar) Drill RodSteel Drill Rod---H19/H22, Length: 0.5M to 6.0M.Thread ...