... : 4.8, 6, 7, 11, 12 3.Water Hole: 2 Quarry Bits We are a manufacturer specializes in producing kinds of rock ... drilling tools includes taper chisel bits, cross bits, button bits, tapered drill rods, integral drill steels, plug hole ... material according to the different working conditions. The chisel drill quarry bits are made from grade hard alloy and special steel, generally ...