Covering 6 of the most common lugnut sizes, the TEKTON 4-Piece 1/2 in. Drive Impact Flip Socket Set features professional-grade quality. Flank-drive socket design contacts only flat surfaces of fastener head to eliminate rounding off corners. Constructed from drop forged, heat-treated chrome molybdenum steel, the sockets are built to last. Each flip socket has a black electro plated finish, and the extension bar has a black oxide finish. Impact flip sockets are designed for use with impact tools.