StopTech Sport Rotors are 1-piece direct replacement brake discs for factory brake systems and stock calipers. This part number (127.33144L) refers to the Front Left position. These rotors feature a cross-drilled and slotted surface finish which helps significantly with heat and brake gas dissipation, enhancing cooling and increasing 'bite' for improved stopping power in all conditions. High-quality G3000 metallurgy provides increased durability and resistance to cracking. The rotors feature a black e-coat finish on the hats and vanes to provide long-lasting corrosion protection. This is a single rotor (1 unit). Recommended to be replaced in pairs with the matching Right side rotor (127.33144R). Specs: Vented 312x25mm, 5x112 bolt pattern.