Excellent standard features including adjustable length and tilt on the extensions, adjustable width and angle of the armrests, spacers to elevate the armrests about a half inch (13 mm), flip-up armrests provide easy access to handlebars, fit both common sizes of road bar diameters (26.0 and 31.8 mm). Easy to install and easy to tweak for comfort and performance. There are lighter weight aero bars and sexier (carbon) aero bars but no other aero bars offer this many features at this price.