StopTech Sport Rotors are 1-piece direct replacement brake discs for factory brake systems and stock calipers. This Front Left Drilled Sport Rotor (128.33138L) features a cross-drilled pattern that improves cooling and helps wipe away debris for consistent braking performance. The rotor is finished with a black e-coating for superior corrosion protection. Specifications: Diameter 345mm, Thickness 30mm, Bolt Pattern 5x112. This is a single component. Note: For a complete axle set, this part must be paired with the Front Right Rotor (Art. 128.33138R).