These decorative caps really dress up those plain bolt heads on the primary and transmission side of your engine. Just tap them on over any of the ¼ inch allenhead bolts used on the primary crankcase, transmission, cam housing, and any other place the ¼ inch socket head bolts are used. The decorative 44 MAGNUM bolt CAPs are made from actual Starline 44 mag shells and come in either highly polished brass or nickel. To enhance their look even more, the brass shells come with nickel primers (centers), and the nickel shells come with brass primers. The caps are four tenths of an inch long and extend just over 1 tenth of an inch beyond the allen head bolts. Sold in sets of 4, 9 and 16 and available in brass or nickel.