The 12pc. 3/8″ SAE 12pt. Universal Impact Socket Set by Sunex is CR-MO alloy steel for a long life. The set has a Lifetime warranty. The set comes with a heavy duty blow molded storage case. The 12 Point sockets offer double the starting points as 6 point sockets. The SAE (inches) sizes included 3/8″ drive deep universal are 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, 15/16, 1.