Mount for most handlebars diameter 22.2-25.4mm/0.87-1in. It can be easily installed on bicycles, road bikes, MTB, BMX, Kids Bike, scooter etc. The handle of the bell can be rotated 360 degrees, so you can install one on one side for both hands use. Exquisite design, bells have been improved on the old models which are more rounded and unique. The sound is loud and clear, and pedestrians and traffic can be heard. It will undoubtedly make you and your child safer. Our bicycle bells are made of high-quality iron plastic materials, which are wear-resistant, rust-proof and waterproof. Even in rainy days, you can take this bicycle bell to go out. It contains new designs and spraying processes. It has anti-rust function to ensure longer use. Each set contains 2 bells, so it can be given to others, shared with relatives and friends; bells are available in multiple colors, suitable for all groups of men, women and children.