StopTech Slotted & Drilled Sport Brake Rotors are 1-piece direct replacement brake discs for your factory brake system and stock calipers. These 'Sport Rotors' provide significantly improved stopping power and cooling compared to standard rotors. The unique cross-drilling and slotting aids in heat and brake dust dispersal, prevents pad glazing, and improves wet weather performance. Finished with a black e-coating for superior corrosion resistance. This part number (127.33131L) refers to the Front Left (Driver Side) rotor. For a complete front set, it is often paired with 127.33131R (Front Right). Specifications: Rotor Diameter: 312mm, Height: 49.5mm, Thickness: 25mm, Bolt Pattern: 5x112.