... , face design: Flat face, Drop centre, Normal and Retrac body.Tungsten carbide (Buttons): Spherical, Ballistic and Conical. (Threaded R32, R38, T38, T45, T51 ... , U82, U84, U85, U92, U94, U95, U118 and coal bolting bit and coal bolting rod.6. All kinds of casing bits for shield ... , 33mm, 38mm, etc.8. Blast furnace tap hole drill tools. (Rod, Cross bits, button bits and X-type bits etc). extension ...