The product is a set of lift blocks and U-bolts designed for a 5-inch lift on the rear of Chevy and GMC pickup trucks and SUVs, specifically for models with rear-wheel drive or four-wheel drive. The lift blocks and U-bolts are made of cast iron and are manufactured by Superlift with the part number 3859. This product is intended to provide increased height and support for the rear suspension of compatible vehicles, enhancing their off-road capabilities and overall performance.