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): 321 Height (mm): 44 Thickness (mm): 28 Minimum thickness (mm): 26 Axle application: Front APPLICATION Brand Model Engine Value Power (KM) Year OPEL ASTRA (H) OPC 2.0 TURBO 240 2004-2010 OPEL ASTRA GTC (H) OPC 2.0 TURBO 240 2005-2011 OPEL ZAFIRA (B) OPC 2.0 TURBO 240 2005-2010 VAUXHALL ASTRA (H) 2.0 TURBO VXR 240 2005-2010 VAUXHALL ASTRA SPORT HATCH (H) 2.0 TURBO VXR 240 2005-2011 VAUXHALL ZAFIRA (B) 2.0 TURBO 240 2005-2010