Replace your factory u-bolts with these zinc plated corrosion resistant Tuff Country 17152 Silverado/Sierra 3500HD u-bolts. Designed specifically for lifted vehicles. This kit includes (4) u-bolts along with nuts and washers.Details: Rear Axle U-Bolt Kit Zinc plated to resist corrosion (4) U-bolts, nuts and washers Designed specifically for lifted vehicles Made In The USA Sold As A Kit Fits: 2011-Present Chevrolet Silverado 3500HD 4WD (Lifted w/1 inch blocks) 2011-Present GMC Sierra 3500HD 4WD (Lifted w/1 inch blocks)