The AMERICAN MADE Motobilt Jeep TJ 4" stretch cut corners move the wheel well opening back 4"s. This allows you to move your Jeep's axle back 4"s and maintain a proportional appearance. The corners are laser cut and cnc formed in house at Motobilt. They are made from 3/16" thick steel plate and all of the mounting holes are count sunk. The provided hardware gives a clean smooth look to your install. A 4 1/2" laser cut hole is provided in back so that you can mount a 4" round led tail light flush with the corners.