our dominant drill bits are chisel bits, cross bits, buttons bits, DTH bits We are a professional company which is specialized ... of the products. Tapered Drill BitType --Chisel Bits / Cross Bits / Button Bits Diameter---28mm,30mm 32mm,34mm,36mm,40mm,42mm,44mm Thread Drill Bits---Diameter: ... Coupling sleeve---R22,R25,R28,R32,R38,T38,T45,T51 Down-The-Hole Tools1) DTH BIT---65MM to 254mm.2) DTH Hammer ...