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): 324 Height (mm): 52 Thickness (mm): 28 Minimum thickness (mm): 26 Axle application: Front APPLICATION Brand Model Engine Value Power (HP) Year of manufacture VOLVO XC60 2.0 TD 190 2015-2017 VOLVO XC60 T5 2.0 TURBO 250 2015-2017 VOLVO XC60 D4 2.4 TD 190 2015-2017 VOLVO XC60 2.4 TD 220 2015-2017