... the high quality and reliability of the products. Tapered Drill BitType --Chisel Bits / Cross Bits / Button ... 30mm 32mm,34mm,36mm,40mm,42mm,44mm Thread Drill Bits---Diameter: 51mm to 127mmThread Type---R22, ... Shape---Plate, Concave, Convex.Bit Shank & Coupling sleeve---R22,R25,R28,R32,R38,T38,T45,T51 Down ... ---Suitable for had rock ( more than 2067bar) Drill RodSteel Drill Rod---H19/H22, Length: 0.5M to 6 ...