The AC Delco 11 Piece 1/2-Inch Metric Deep Impact Socket Set contains the most common metric socket sizes you will need for tightening and loosening nuts and bolts. All parts of this Socket Set are made from drop forged steel with a rust resistant finish for long life and durability. This is a great Socket Set to have on hand for home improvement and automotive projects. Packaged inside a convenient storage case that keeps the sockets organized.