Various adjustment options: The bike mirror can be rotated 360° in three positions: Mirror lever, mirror and base. This allows the viewing angle to be adjusted in all directions without restricting the line of sight Riding stability: bicycle rearview mirrors are fixed by several screws, after adjusting the mounting angle, make sure to tighten the screws thoroughly in each position, so that the bicycle mirror will be more stable and less likely to wobble Material: Chrome-plated glass mirror ensures a clear, calm view of the road. High-quality nylon rods and frame are coated to prevent damage. Aluminum base is stable and durable. Rubber caps prevent screws from rusting and provide an attractive appearance Wide range of applications: These bicycle rearview mirrors always fit handlebars with an inner diameter of 0.87-1in (22.2-25.4 mm). These mirrors are suitable for bicycles, e-bikes, e-scooters, mountain bikes and other models Installation instructions:1. place the washer on the handlebar with the opening facing out.2. place the base on the washer, the openings of the base and the washer must match.3. insert the screws into the base and align them perfectly with the base.4. tighten them by hand, then with a wrench.5. adjust the nut on the mirror bar to check the field of view and tighten it Product features mirror: large irregular stylish border 5.71in (14.5cm) long - 2.17in (5.5cm) wide base inner diameter: 0.87-1in (22.2-25.4 mm), fixed handlebar bike mirror. Multifunctional adjustable: bicycle mirror's bar can be adjusted 360 ° in any direction up, down, outward, etc., the base can be rotated 360 ° in one direction, the frame can be rotated 360 ° and adjusted up and down by 55 degrees.