1. HD automotive grade convex glass bicycle rear view mirror with safe shatterproof film provides clearer and sharper images. It is 360 degree rotatable and 180 degree adjustable, allowing a viewing angle that suits your position. The lens size is 4.7 x 2.4 inches, offering a wider field of view to see more behind you and improve riding safety. 2. Universal rightside design for flat handlebars. Fits 2126 mm outside diameter MTB and cruiser handlebars. Suitable for mountain bikes, Ebikes, and similar setups. DOESN'T FIT DROP BAR BIKES. 3. Built for durability. Made with PA630% GF impact frame. Solid 304 stainless steel screws for installation. Aluminum alloy black clamp and adjustable spacer provide a secure and stable connection to the handlebar. 4. Lens and hardware details. 4.7 x 2.4 inch wide wingshaped glass lens, scratch resistant, with a shatterproof film for lasting clarity. Constructed with a sturdy nylonandfiber frame, waterproof rubber ring, and reliable stainless steel screw. Easy installation with the included 4 mm hex key. Flexible and variable installation methods. Use scenarios Daily commuting in urban or suburban traffic: enhanced rear visibility helps you notice approaching vehicles earlier, improving lane changes and safe riding decisions. Mountain biking or cruising on varied terrain: large rear view area and adjustable angle allow quick checks behind without losing focus on the trail. Ebike or cruiser riding on roads or mixed surfaces: reliable mounting and secure fit on 2126 mm handlebars provide dependable performance at different speeds and road conditions.