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: Full Number of holes: 4 Diameter (mm): 264 Height (mm): 42 Thickness (mm): 10 Minimum thickness (mm): 9 Axle application: Rear APPLICATION Brand Model Engine Value Power (HP) Year OPEL ASTRA CONVERTIBLE (TWIN TOP) 1.6 2005-2011 OPEL ASTRA CONVERTIBLE (TWIN TOP) 1.6 TURBO 2007-2011 OPEL ASTRA CONVERTIBLE (TWIN TOP) 1.8 2005-2011 OPEL COMBO TOUR 1.3 TD 2004-2011 OPEL COMBO TOUR 1.4 2004-2011 OPEL COMBO TOUR 1.6 2001-2011 OPEL COMBO TOUR 1.7 D 2001-2011 OPEL COMBO TOUR 1.7 TD 2004-2011 OPEL MERIVA 1.3 TD 2004-2010 OPEL MERIVA 1.6 16 2002-2010 OPEL MERIVA 1.7 TD 100 2002-2010 OPEL MERIVA 1.8 2002-2010 VAUXHALL ASTRA CONVERTIBLE (TWIN TOP) 1.6 2005-2011 VAUXHALL ASTRA CONVERTIBLE (TWIN TOP) 1.8 2005-2011 VAUXHALL MERIVA 1.3 TD 2005-2010 VAUXHALL MERIVA 1.6 16 2002-2010 VAUXHALL MERIVA 1.7 TD 100 2002-2008 VAUXHALL MERIVA 1.8 2002-2008