Outside Diameter (mm) 317; Nominal TH (mm) 30; Min TH (mm) 27 High Carbon cast iron minimizes noise and vibration and provides maximum performance and enhanced driving comfort. Brembo developed replacement that meets or exceeds OEM specifications. IMPORTANT! The package contains a single disc. Please note that the discs must always be replaced per axle (in pairs), therefore, in the case of one disc per pack, two packs must be purchased.