Replace your factory u-bolts with these zinc plated corrosion resistant Tuff Country 17852 Silverado/Sierra 1500 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: 1988-1998 Chevrolet Silverado 1500 4WD (Lifted w/4 inch blocks) 1999-2018 Chevrolet Silverado 1500 4WD (Lifted w/4 inch blocks) 1988-1998 GMC Sierra 1500 4WD (Lifted w/4 inch blocks) 1999-2018 GMC Sierra 1500 4WD (Lifted w/4 inch blocks) Tech Specs: Bolt Diameter: 19/16 Inch Inside Diameter: 2.75 Inches Length: 12.625 Inches Bend Type: Square