... : 4.8, 6, 7, 11, 12 3.Water Hole: 2 Rock Drilling Tools 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 ... rock drilling tools are made from grade hard alloy and special steel, generally matched with the light-duty rock drill, to drill the rock hole ...