WinmaX WD Performance Sports Drilled Brake Discs Subaru WRX STI VA Yellow 4-pot 326mm diameter rear pair. WinmaX brake rotors offer a performace upgrade over OE discs by using high quality castings and improved cooling to be able to handle more spirited driving on the street or track. Disc Specifications: Diameter (mm): 326 Height (mm): 63.5 Thickness (mm): 20 Minimum Thickness (mm): 18 Centre Hole (mm): 58 Stud Holes: 5 Weight (kg): 8.35