Sunex 5120 1-Inch Drive 3-3/4-Inch Impact Socket CR-MO alloy steel for long life Lifetime warranty Industrial strength, double latch blow mold case Will meet a variety of needs Set includes in SAE - inches: 1, 1-1/16, 1-1/8, 1-1/4, 1-5/16, 1-3/8, 1-7/16, 1-1/2