This is an Acorn Style Lug Nut for 7/16 inch studs, and feature a cone style seat. Pick up a new set, especially when buying a new set of wheels. These 7/16 inch stud Acorn Bulge lug nuts use a 3/4"" socket and are Right-hand thread. Lug nuts sold as a set of 5. Lug nuts are an easy way to freshen up an aging set of wheels. Keep a new set in the shop, and install during service, tire installation or rotation. Replace worn or damaged lug nuts immediately.