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): 365 Height (mm): 54 Thickness (mm): 32 Minimum thickness (mm): 30 Axle application: Front APPLICATION Brand Model Engine Value Power (KM) Year HOLDEN HSV (AUST / NZ) E AP 2006-2013 HOLDEN HSV (AUST / NZ) E 2006-2013 VAUXHALL VXR8 6.0 414 2007-2008 VAUXHALL VXR8 6.2 435 2008-2013 VAUXHALL VXR8 6.2 SUPERCHARGED 564 2009- 2013