... our dominant products are chisel bits, cross bits, buttons bits, DTH bits with high, medium and low air pressure, symmetric drilling ... ,36mm,40mm,42mm,44mmThread Drill Bits---Diameter: 51mm to 127mmThread Type---R22,R25,R28,R32,R38,T38,T45,T51Face Shape---Plate ... ,R32,R38,T38,T45,T51Down-The-Hole Tools1) DTH BIT---65MM to 254mm.2) DTH Hammer---76MM /90MM /110MM 3) Face ShapeConvex ...