CatEye BM-45 Bar End Mirror Description: The CatEye BM-45 Bar End Mirror easily attaches to drop and flat bars. A simplified expanding plug design enables painless installation with the use of just a 3mm Allen key. Experience a nearly distortion-free view of traffic and conditions behind you with a generous 45mm diameter lens that offers minimal projection outside the shape and size of most handlebars. Features: Bar-end mounted rear view cycling mirror Quality aluminum and glass construction Compatible with flat and drop handlebars Minimal projection from the bar Includes 3mm allen key Specifications: Lens Size: 45mm diameter Weight: 35g Applicable Diameter: 16?25.4mm Tightening torque: 8.5Nm