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In the past it was always a hassle to repair the rear end threads, but know King Racing Products has developed this handy screw thread repair tool that makes repairing your rearend 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. Comes with six industrial thread inserts Heavy duty drill bit and nitrate tap are included.