Chrome Molybdenum alloy steel for long lifeRadius corner design extends the life of fastenersHeavy duty blow molder storage caseSizes Included are, 7/16″ Impact Socket – 2141/2″ Impact Socket – 2169/16″ Impact Socket – 2185/8″ Impact Socket – 22011/16″ Impact Socket – 2223/4″ Impact Socket – 22413/16″ Impact Socket – 2267/8″ Impact Socket – 22815/16″ Impact Socket – 2301″ Impact Socket – 2321-1/16″ Impact Socket – 2341-1/8″ Impact Socket – 2361-1/4″ Impact Socket – 240