Color  coded set of  4 size:

3/8"(red),1/2"(blue),5/8"(big black),and 3/4"(white);

Services1981-current Ford and some 1994-current Chrysler vehicles .

Fuel line tool:

Works on 5/16",3/8",and 1/2" fuel lines  3/8"(yellow) and 1/2"(green) fittings release spring lock connectors  5/16"(gray) and 3/8"(blue) release quick connect fuel line fitting