The name of these handlebars says it all. These 1 1/4" (32mm) diameter bars will give your bike a great massive look and will fit the standard or aftermarket controls and grips. T-Bars bolt straight onto the upper fork clamp of most Harley models with a 3 1/2" (88.9mm) center-to-center. These handlebars are dimpled and drilled for internal wiring and are not suitable for Throttle-By-Wire.