Product Description Extruded aluminum lowering blocks are 2-1/2" wide and 5" long U-bolts fit 3" diameter axle housings and are 10" long to fit a variety of applications U bolts are a premium steel construction and are zinc plated for corrosion resistance Drops the ride height on vehicles with the axle mounted on top of the leaf springs Specs Material Type:Aluminum Sold in Quantity: Kit Notes: U bolt is 10" x 3". Thread Pitch: 1/2"-20 Overall Height : 3.00 Overall Width: 2.50 Overall Length: 5.00 .