... high quality and reliability of the products. Tapered Drill BitType --Chisel Bits / Cross Bits / ... Drill Bits---Diameter: 51mm to 127mmThread Type---R22,R25,R28,R32,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 ... for had rock ( more than 2067bar) Drill RodSteel Drill Rod---H19/H22, Length: 0.5M to ...