Tough, instant pickup 120 point triple wedge pawl system with a bushed mini threaded driver for Singlespeed and Dirt Jump No cog is included so user can choose the gearing that works best, 916t. Use HL-328* Tool HL3201 needed for cog removal Bushed driver is more durable than cartridge bearings Forged 6061 aluminum shell, 2 main body sealed cartridge bearings CrMo M10 boltin fittings with 6mm anti-rotation hex fitting (helps when tightening wheel in frame), 14mm adapters included International Standard 6bolt disc rotor mount