Portland Design Works Watch Your Back Bar End Mirror Description: The Portland Design Works Watch Your Back Bar End Mirror installs easily on either flat handlebars or road drop handlebars using an intuitive expanding plug design to safely lodge itself within handlebar ends. Gain the ability to peer behind oneself without having to turn or crane one's neck with this generous 2.75" mirror lens. Features: A bar end mirror made with HD glass Internal-expanding plug system fits most flat or drop handlebars Specifications: Color: Black Weight: 88g Compatibility: 14.8 - 23mm inner diameter handlebars