Features: The sheet is a convex mirror with wide angle, and its field of vision is wider and its deformation is moderate. There is a 3-dimensional 360-degree adjustment axis, reflected light without blind spots Easy to install, just loosen the screws to fix the mirror on the handlebar, and then tighten the screws. Suitable for 17.4-22mm/15-35mm bicycle handlebar Specifications: Material: ABS. Color: black. Size: 14*7cm. Applicable diameter: applicable to handlebars with diameter of about 17.4-22mm Diameter : 7 Package included: 1/2 x Rearview Mirror. Notices: 1) There could be some slight differences in the color tone of the pictures and the actual item. 2) Please allow 1-2mm differs due to manual measurement, thanks. 3) If there is any problem with the product, please contact me before you leave a comment, I will do my best to solve the problem for you.Thank you for your understanding.