StopTech Sport Slotted & Drilled Brake Rotors are premium 1-piece direct replacement brake discs for factory brake systems and stock calipers. They offer improved cooling and shorter stopping distances under all weather conditions. This specific part (127.44174L) is the Front Left (Driver Side) rotor. Features include: 1. Drilled holes for superior heat dissipation and gas venting. 2. Slotted surface to wipe away debris and keep pads clean. 3. E-Coating finish to protect against corrosion on non-friction surfaces. 4. High-carbon metallurgy for reduced noise and improved durability. This is a single rotor unit. For a complete front axle set, please order 127.44174R (Right) in addition to this item.