If you have ever crashed a Sprint Car before then the chances are you have damaged or pulled the threads right out of the snout of the rear end. In the past it was always a hassle to repair the rear end threads, but know King Racing Products has developed this handy tool that makes repairing your rear easier than ever. The kit utilizes industrial thread Inserts that are installed like heli coils. No more taking the rear end apart and to a machine shop; do it yourself, in your garage, parking lot, or trailer. A must for every race team.