... in metallurgy mine, geological exploration,traffic tunneling. Product Name:Button Bits1) Material:45CrNiMoV for steel,YK05 for carbide2)Diameter: ... .32mm, 35mm, 38mm; Round 32mm, 38mm, 45mm, 51mm)Retrac Button bits with different Thread different diameters. (51mm, 64mm,70mm,76mm ... drilling(drill bits, hammers, spare parts, drill tubes)Buttons type :Spherical, Ballistic Drill rods,drill bits,Button Bits