1.PDC coal mining tools 2.ore mining, many type 3.good price,high quality 4.professional manufacurer ... design: Flat face, Drop centre, Normal and Retrac body.Tungsten carbide (Buttons): Spherical, Ballistic and Conical. (Threaded R32, R38, T38, T45 ... .8. Blast furnace tap hole drill tools. (Rod, Cross bits, button bits and X-type bits etc). PDC coal mining tools