Easily Disconnects Air Conditioning Lines and Quick Connect Fuel Lines. Set of six tools which disconnect the spring lock couplings on Ford and Chrysler air conditioning line. Also works on fuel line quick connect couplings found on GM, Ford, and Chrysler. The 5/16" size fits on push lock connectors found on Ford radiators and transmission lines. Easy to use in confined spaces. Set includes six sizes: 5/16", 3/8", 1/2", 5/8", 3/4" and 7/8".