... ,44mmThread 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,T51Down-The-Hole Tools1) DTH BIT---65MM to 254mm ... .Thread Rod---R25,R28,R32,R38,T38,T45,T51. Integral Drill Rod---H19/H22, Diameter---20mm - 42mm. tapered drill bit