... , eccentric drilling tools, standardized API system casings, bit shanks and casing tubes which are fit for hydraulic ... R38,T38,T45,T51Face Shape---Plate, Concave, Convex.Bit Shank & Coupling sleeve---R22,R25,R28,R32,R38 ... ,T38,T45,T51 Down-The-Hole Tools1) DTH BIT---65MM to 254mm.2) DTH Hammer---76MM /90MM ... ---Suitable for had rock ( more than 2067bar) Drill RodSteel Drill Rod---H19/H22, Length: 0.5M to 6 ...