This is a Rotor ITA30 BB Steel bottom bracket designed to allow 30 mm spindle cranksets (such as many Rotor cranks) to be fitted into ITA (Italian threaded) bottom bracket shells. Italian BB shells have right hand threads on both sides and a standard 70 mm shell width, common on classic Italian and some performance road frames. The unit uses steel bearings housed within 7075 T6 CNC machined aluminum cups, and includes silicone seals to help block dirt and moisture, delivering reliable pedaling performance and long service life.