Set Includes, Tap for threading aluminum handlebars, a pair of HDB bar end Threaded Inserts and fasteners. * Note: threaded inserts do not work with steel or thin wall handlebars. If your bike has steel or thin wall handlebars, you may upgrade the bars below. * Some bars may need to be drilled out to the correct ID (approx .55") for the threaded inserts to work. If needed HDB can do this free of charge.