American Automotive 3" Rear Suspension Lift Steel Blocks + Extra Long 12" Square Leaf Spring Axle U Bolts FITMENT: All makes and models with a single 9/16" axle pin hole and 2.5" leafs that require square 12.5" extra-long clamp; threads can be cut down CONTENTS: 2 US certified tapered steel lift blocks with 4 OEM grade steel square bend u-bolts, hi-nuts and extra thick washers TECHNICAL NOTES: Install the tallest ends of the tapered rear blocks to the rear of the vehicle; Retighten u-bolts after the first 500 miles BENEFITS: American Automotive steel lift blocks are stronger than aluminum. They are designed to increase rear load and towing capacity. American blocks absorb noise and vibrations, and are tapered for perfect pinion alignment. Made for maximum u bolt clamp force with an even distribution of pressure, American axle u bolts eliminate flexing and provide the strength to maintain original vehicle handling. 4 x certified carbon steel square leaf spring axle u-bolts. hi-nuts and washers 2 x carbon steel tapered lift blocks Instructions Length:12&#034; x Width: 2.5&#034; x  9/16&#034; Thread Pitch 5&#034; thread can be cut down to fit other applications 3&#034; Tall x 2.5&#039; Wide x 5&#034; Long 9/16 pin