Left or right is determined as sitting on the bike with mirror mounted under handlebar Will fit most handlebars and clip-ons with an outside diameter of 7/8" to 1" CNC-machined billet aluminum with stainless steel hardware Gooden-TiteĀ« bushing mounting system to reduce vibration 2-1/2" diameter Fully adjustable Made in the U.S.A.. MIRROR BAR END LEFT CHR