Advantage Vented 1-Piece Front Brake Rotor (18A2461A) by ACDelco. Quantity: 1 Per Pack. ACDelco Advantage brake rotors and drums feature the fit form and function of premium aftermarket brakes at a more economical price. The ACDelco Advantage line offers dependability performance and great value ? without sacrificing important features and benefits. Features: No machining required ? ready to be installed right out of the box Mill-balanced for proper rotor function Quality validated for proper metallurgy and correct brake plate thickness Non-directional brake surface finish for consistent braking Chamfer angle follows the OE design