The 19pc. 1/2″ SAE 12pt. Deep Impact Socket Set by Sunex is Chrome Molybdenum alloy steel for long life. The radius corner design extends the life of fasteners. It comes with a heavy duty blow molder storage case. The sizes included are 3/8″(26701), 7/16″(26702), 1/2″(26703), 9/16″(26704), 5/8″(26705), 11/16″(26706), 3/4″(26707), 13/16″(26708), 7/8″(26709), 15/16″(26710), 1″(26711), 1-1/16″(26712), 1-1/8″(26713), 1-3/16″(26714), 1-1/4″(26715), 1-5/16″(242ZD), 1-3/8″(244ZD), 1-7/16″(246ZD), 1-1/2″(248ZD).