Made from 3/16" mild steel, our 1 piece design is one of the strongest on the market while allowing the leaf spring to flex over a rounded corner, resulting in better articulation and less stress risers. The top plate is 3/8" mild steel with multiple center pin mounting holes, allowing you to always center the plate on top of your perch for maximum flex and clamping strength. All Red Summit sheet metal products are laser cut and CNC bent for a perfect fit every time. This item must be welded to your axle. ***U-bolts NOT included***