(Hubs include studs and races, all other parts sold separately.) Designed for use in classes that require steel hubs and drive flanges. The cog style drive flange reduces weight by 2 lbs.. Uses standard 8 bolt rotors and available in 5 x 5”, 5 x 4-3/4” and 5 x 4-1/2” bolt patterns with 1/2” fine, 5/8” fine or 5/8” coarse studs. Kit includes: Hub, Bearings, Seal, Drive Flange, Rotor, Axle Nut, Axle Washer, Bolts. Optional aluminum drive flange and heavy duty heat treated steel drive flange available.