Our 2 piece rear c-notch kit is essential when lowering your C10 truck as it allows for an additional 2" of axle-to-frame clearance. It is completely bolt-in and the two piece design not only increases strength, but also simplifies installation. Constructed of 3/16" steel the overlap section creates a 3/8" thick section above the axle where strength is compromised the most. Installation is a breeze as the top section is positioned first and serves as the template for cutting the notch in your frame. The lower piece bolts right in eliminating all guesswork for a perfect fit every time. Drilling for 1/2" bolts and minimal cutting for is required for fitment. Sold raw and comes as a set with all hardware required.