... 2.High penetrability. 3.Can match many famous drilling machine, such as Atlas Copco, Sandvik, Ingersoll- Tapered Drill BitType --Chisel Bits ... 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.2) DTH Hammer---76MM /90MM ... Rod---H19/H22, Diameter---20mm - 42mm. rock tapered chisel bit