FULL RANGE OF STANDARD SIZES ON A HANDY STORAGE RAIL: The set comes with a convenient snap-in metal storage rail that lets you keep the sockets organized in a toolbox, on a workbench and while you move. The following sizes are included: five 1/4" sockets E4, E5, E6, E7, E8 and six 3/8" sockets E10, E12, E14, E16, E18,E20