1.extension rod 2.ore mining and many type 3.good ... Flat face, Drop centre, Normal and Retrac body.Tungsten carbide (Buttons): Spherical, Ballistic and Conical. (Threaded R32, R38, T38, T45 ... U95, U118 and coal bolting bit and coal bolting rod.6. All kinds of casing bits for shield machine ... 38mm, etc.8. Blast furnace tap hole drill tools. (Rod, Cross bits, button bits and X-type bits etc). extension ...