7 piece set is made in the U.S.A., featuring the SK's High Visibility technology. The sockets are coated with a rust-preventative compound, which makes them exceptionally resistant to corrosive factors. In addition to the rust-preventative coating, the sockets are laser engraved every 120° with extra-large markings for improved readability.SureGrip® Drive Design drives the side of the fastener, not the corner, to provide increased strength and avoid rounding of rusted or damaged fasteners.Corrosive resistant and laser engraved every 120 degrees3/8" Drive Deep Swivel High Visibility Impact Sockets - 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4"