1.coal mining tools 2.ore mining, many type 3.good price,high quality 4. ... ) taper rods in most lengths.A comprehensive range of button bits, cross bits and chisel bits with (6, 7 ... design: Flat face, Drop centre, Normal and Retrac body.Tungsten carbide (Buttons): Spherical, Ballistic and Conical. (Threaded R32, R38, ... furnace tap hole drill tools. (Rod, Cross bits, button bits and X-type bits etc).