These USA made bars have the ultimate style, great comfort and quality. At 1 1/4" (3.2cm) diameter, they are 25% thicker than stock, and eliminate the wimpy look of the standard 1" (2. 54cm) handlebars. The "step down" design fits all standard or aftermarket controls and grips. T-Bars take 1/2"-13 UNC riser bolts.