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: 4 Diameter (mm): 250 Height (mm): 49 Thickness (mm): 22 Minimum thickness (mm): 20 Axle application: Front APPLICATION Brand Model Engine Value Power (KM) Year NISSAN BLUEBIRD T12 1.6 86-87 NISSAN BLUEBIRD T72 1.6 87-90 NISSAN BLUEBIRD U11 1.8 84-86 NISSAN BLUEBIRD T12 1.8 86-87 NISSAN BLUEBIRD T72 1.8 87-90 NISSAN BLUEBIRD U11 1.8 TURBO 84-86 NISSAN BLUEBIRD T12 1.8 TURBO 86-87 NISSAN BLUEBIRD T72 1.8 TURBO 87-90 NISSAN BLUEBIRD U11 2.0 84-86 NISSAN BLUEBIRD T12 2.0 86-87 NISSAN BLUEBIRD T72 2.0 87-90 NISSAN BLUEBIRD T12 2.0 D 86-87 NISSAN BLUEBIRD T72 2.0 D 87 -90