... equipments as well, and our dominant products are chisel bits, cross bits, buttons bits, DTH bits with high, medium and low air pressure, symmetric ... ,30mm 32mm,34mm,36mm,40mm,42mm,44mmThread Drill Bits---Diameter: 51mm to 127mmThread Type---R22,R25,R28,R32,R38,T38,T45,T51Face ... Drill Rod---H19/H22, Length: 0.5M to 6.0M.Thread Rod---R25,R28,R32,R38,T38,T45,T51. Integral Drill ...