Turbo Groove automotive brake discs have a widened, arcuate gap that increases the flow of cool air, lowering the temperature of the brake pads and brake 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: 4 Diameter (mm): 255 Height (mm): 49 Thickness (mm): 25 Minimum thickness (mm): 23 Axle application: Front APPLICATION Brand Model Engine Value Power (HP) Yearbook TOYOTA COROLLA ZZE120 1.4 2002-2007 TOYOTA COROLLA ZZE121 1.6 2002-2007