Chisel Drill Rock Tools 1.Diameter: 30mm - 46mm 2.Taper: 4.8, 6, 7, 11, 12 3.Water Hole: 2 Rock Tools We are ... producing kinds of rock drilling tools includes taper chisel bits, cross bits, button bits, tapered drill rods, integral drill steels, plug hole integral ... as material according to the different working conditions.The chisel drill rock tools are made from grade hard alloy and special steel ...