1. Applicable bicycle models and fit Giant Defy 4 Defy 5 Defy Advanced Defy Advanced Pro. Fits handlebars with a diameter of 22–32 mm (please measure the handlebar before ). Mounts on either side using the included nonslip rubber gaskets and screws. Built to withstand daily riding, bumps and vibrations without loosening or breaking, while protecting your handlebars from scratches. 2. materials Made with a ABS shell, tough aluminum tubing, antislip rubber base and a glass mirror. ABS shell resists impact and wear; thickened aluminum tube is durable and deformationresistant; glass lens provides a broad view; antislip base increases friction. 3. Clear and wide field of vision Convex glass lens delivers an HD, wideangle rear view with no blind spots. Easily monitor vehicles, cyclists and pedestrians behind you. Glare surface ensures a crisp reflection in various light conditions, improving safety for commuting, touring or mountain biking. 4. 360 degree adjustable Fully rotatable mirror head and bendable aluminum support rod allow adjustment to virtually any angle. Bend or rotate to suit height, riding posture or terrain for an rear view without turning your head. Installation and removal take minutes with no special tools required. 5. Use scenarios Urban commuting and city rides where rear traffic awareness matters. Longdistance touring or highway rides requiring constant rear awareness. Mountain biking or mixedterrain rides where awareness of riders behind is helpful.