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: 5 Diameter (mm): 312 Height (mm): 62 Thickness (mm): 20 Minimum thickness (mm): 18 Axle application: Back APPLICATION Brand Model Engine Value Power (HP) Yearbook BMW M3 E36 3.0 92-96 BMW M3 E36 3.0 92-96 BMW M3 E36 3.2 96-2000 BMW M3 E36 3.2 96-2000 BMW M-ROADSTER / COUPE (Z3) 3.2 98-2003 BMW Z3 3.2 M 325 98-2003