The Chevrolet Silverado and GMC Sierra 2015 through 2018 Aluminum Rear Cargo Rack is a practical and durable solution for your truck's cargo needs. With its proprietary heptagonal formed tube construction and aluminum construction material, this rack is built to last. It includes 4-inch vertical lumber stops, sold individually, and is weather resistant. Designed to fit most Chevrolet Silverado 2015-2018 models with 5 1/2, 6 1/2, or 8-foot box beds, as well as most GMC Sierra 2015-2018 models with the same box bed sizes, this cargo rack is a versatile and reliable addition to your truck.