... Tapered Drill BitType --Chisel Bits / Cross Bits / Button Bits Diameter---28mm,30mm 32mm,34mm,36mm,40mm,42mm, ... ---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,T51Down-The-Hole Tools1) DTH BIT ... 0.5M to 6.0M.Thread Rod---R25,R28,R32,R38,T38,T45,T51. Integral Drill Rod---H19/H22 ...