The Snap-on 5-pc 1/2" Drive Metric Increased Hex Depth Lug Socket Set, No. 305LSDM, is engineered with deeper hex geometry for a better fit in securing the socket further onto the lug nut to reduce the risk of breaking or damaging decorative caps. When using an impact driver, the deep sockets help prevent marring caps. They are precision manufactured in the U.S.A. from special alloy steel and heat-treated with an industrial finish to protect from corrosion.