The StopTech Sport Drilled & Slotted Brake Rotor is a one-piece direct replacement upgrade for your factory brake system. This rotor is specifically designed for the Rear Left position. It features cross-drilling and slotting which helps to dissipate heat and clear brake dust/gases, providing improved biting point and consistent braking performance. The rotor is finished with a black e-coating on the non-friction surfaces to prevent corrosion and maintain a clean look. Related components (often purchased together for a complete axle set): - 127.47037R: StopTech Sport Slotted & Drilled Rear Right Rotor - 309.11140: StopTech Street Performance Brake Pads (Rear) - 126.47037L: StopTech Sport Slotted Only Rotor (Alternative option)