Turbo Groove automotive brake discs have a widened, arcuate slit that increases the flow of cool air, lowering the temperature of the brake pads and 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): 337 Height (mm): 62 Thickness (mm): 30 Minimum thickness (mm): 27 Axle application: Front APPLICATION Brand Model Engine Value Power (KM) Year LAND ROVER DISCOVERY 3 4.4 300 2004-2008 LAND ROVER RANGE ROVER SPORT L320 4.4 2005-2006 LAND ROVER RANGE ROVER SPORT L320 4.4 2007-2008