Upgrade your vehicle's braking system with the ACDelco 18A928A GM 19241880 brake disc rotor. Made from durable cast iron material, this vented rotor has an outside diameter of 13 inches (330.2 mm) and a bolt pattern of 8 x 6.5 inches. It fits perfectly on the rear, left, and right sides of your Silverado, Sierra, or Suburban without compromising its vintage look. This brake disc rotor has an uncoated finish, a thickness of 29 mm (discarded at 26.5 mm), and a rotor style that ensures efficient heat dissipation. It has been tested and proven to meet and exceed OE/OEM standards with interchange part numbers 121.66043, AX55057, 56830R, and BR55057. Don't settle for anything less, upgrade to ACDelco brake disc rotors today. Exact item is shown. New open box with partial original packaging. Non coated cast iron rotor. Item weight 25.2 lbs. Outside diameter 13 inches. 4.2 inch height. Center hole diameter 117.6 inches. Thickness 29mm. Discard thickness 26.5 mm. Made in China. No returns if installed. This item is a new, opened customer return. It has been inspected and passed quality control to insure the condition described and contents are accurate. Please review actual photos as stock photos are not the actual item, our photos are. You will ONLY receive exactly what is shown in photos, regardless of what might have originally been included. Please review our business policies in our store for information regarding returns, shipping and warranties.