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: 5 Diameter (mm): 285 Height (mm): 56 Thickness (mm): 15 Minimum thickness (mm): 13 Axle application: Rear APPLICATION Brand Model Engine Value Power (KM) Year MERCEDES-BENZ M-CLASS (W163) ML230 2.3 98-99 MERCEDES-BENZ M-CLASS (W163) ML230 2.3 99-2000 MERCEDES-BENZ M-CLASS (W163) ML270 2.7TD 99-2001 MERCEDES -BENZ M-CLASS (W163) ML320 3.2 98-99 MERCEDES-BENZ M-CLASS (W163) ML320 3.2 99-2000 MERCEDES-BENZ M-CLASS (W163) ML430 4.3 98-2000