Corrosive resistant and laser engraved every 120 degrees. Extra recess depth and nose-down design. SureGrip hex design drives the side of the fastener, not the corner. Made in the U.S.A.. Lifetime warranty30 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 degrees with extra-large markings for improved readability. All the SK impact sockets feature the SK's SureGrip hex design, which drives the side of the hex, not the corner. This not only provides increased strength, but also avoids the rounding of rusted or damaged fasteners, which can occur when using a sharp cornered hex tool. Extra recess depth to allow for use where threaded fasteners protrude above the nut or where the fastener is domed. The nose-down design extends the taper as far as possible, for improved access over straight wall designs. Sizes include: 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 24mm Standard Sockets, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 24mm Deep Sockets. Packaged in a molded plastic case.