These are 1/2-20 in. RH (UNF) lug nuts with a 17mm hex head and a 60 degree taper to seat (not ball seat). These are quality lug nuts made for us by an Italian manufacturer. Vorshlag "chrome" lug nuts actually use a clear zinc coating that provides better corrosion resistance than chrome, while providing the same look. This catalog entry is for A SINGLE LUG NUT ONLY.