Rock Cross Bit (Taper Type) Diameter: 32mm - 55mm Taper: 4.8, 6, 7, 11, 12 Water Hole: 3 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 integral steels, pick rods, thread cross bits, thread button bits, retrac button bits, extension rods, shank adapter, coupling ...