15 Piece 1/2" Drive, 6 Point Deep Metric Impact Socket Set. 15 piece set is 100% made in the U.S.A., featuring SK"s patented 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 allows for use where threaded fasteners protrude above the nut or where the fastener is domed. Improved black coating retains more rust preventative compound than black oxide. 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm Sockets. Packaged on a rail.