... machine, such as Atlas Copco, Sandvik, Ingersoll- Tapered Drill BitType --Chisel Bits / Cross Bits / Button Bits Diameter---28mm,30mm ... 2067bar)Drill RodSteel Drill Rod---H19/H22, Length: 0.5M to 6.0M.Thread Rod---R25,R28,R32,R38,T38,T45,T51. Integral Drill Rod--- ... H19/H22, Diameter---20mm - 42mm. rock tapered chisel bit