... equipments as well, and our dominant products are chisel bits, cross bits, buttons bits, DTH bits with high, medium and low ... and reliability of the products.Tapered Drill BitType --Chisel Bits / Cross Bits / Button Bits Diameter---28mm,30mm 32mm,34mm,36mm,40mm ... Drill Rod---H19/H22, Length: 0.5M to 6.0M.Thread Rod---R25,R28,R32,R38,T38,T45,T51. Integral Drill ...