RSD 4-Bolt Black Ops Nostalgia Risers This item fits: 1.25" Handlebars with a 1.25" diameter clamping area on Harley Models Two bolt and four bolt risers accepts stock or aftermarket 1" diameter handlebars Four bolt riser accepts stock or aftermarket 1-1/4" diameter handlebars All styles designed to match the entire RSD Nostalgia line Tough, simple and effective 1-1/2" tall CNC machined from billet aluminum Stainless steel hardware included Drilled and tapped for 1/2"-13 mounting bolts Made in the U.S.A.