Sunex 2855 1/2-Inch Drive Universal 12-Point Metric Universal Impact Socket Set, 15 Piece CR-MO alloy steel for long life Lifetime warranty Heavy duty blow molded storage case 12 Point sockets offer double the starting points as 6 point sockets Metric - mm: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24