Usage Tips:Bike Bells - Fits Bicycle Handlebars 2H2-26 Mm (0.83 - 1.0 In) Diameter. Using The Included Hex Key. The Bike Horn Can Be Easily Installed Anywhere On The Bike. Stylish Appearance - Bicycle Bells Have A Beautiful Appearance and Are Suitable for Adults or Children. Designed for Almost All Types of Bikes. Such As Road. Mountain. Hybrid or E-Bikes. Please Measure The Handlebar Diameter Before Buying To Ensure Compatibility and Avoid Disappointment Durable - Made of High-Strength Aluminum Alloy and Abs Material. Durable. Anti-Rust. Anti-Corrosion and Long Service Life. It Can Adapt Well To Harsh Outdoor Environments. While Ensuring Enough Ringtones. It Can Also Avoid Finger Wear Loud Ringtones - Bike Bells Adult Always Provide Us With Crisp and Loud Tones. The Bike Bell Kids Powerful 90-Decibel Chime Lets Pedestrians and Passing Vehicles Hear Your Chime Clearly. Making Riding Safer.