Turbo Groove automotive brake discs have a widened, arcuate gap that increases the flow of cool air, lowering the temperature of the brake pads and brake disc, while draining dust, dirt and hot gases better than a straight line, which can rust and become ineffective. Drilled holes remove surface gases when braking from high speed, while not weakening the structure of the disc as in through drilling. TECHNICAL DATA Type: Drilled and Slotted Full / Ventilated: Ventilated Number of holes: 5 Diameter (mm): 323 Height (mm): 59 Thickness (mm): 30 Minimum thickness (mm): 28 Axle application: Front APPLICATION Brand Model Engine Value Power (KM) Year AUDI A8 D3 / 4E 3.0 220 2003-2004 AUDI A8 QUATTRO D3 / 4E 3.0 TD 250 2003-2004 AUDI A8 QUATTRO D3 / 4E 3.7 280 2002-2004 AUDI A8 QUATTRO D3 / 4E 4.2 340 2002-2003 VOLKSWAGEN PHAETON 3.2 240 2002-2008 VOLKSWAGEN PHAETON 4.2 335 2002-2016