The 7pc. 3/8″SAE 6pt. Universal Impact Socket Set by Sunex is Chrome Molybdenum alloy steel for a long life. The radius corner design extends the life of fasteners. The set comes with a heavy duty blow molder storage case. The sizes included are 3/8″, 7/16″, 1/2″, 9/16″, 5/8″, 11/16″, 3/4″.