About this item Material: made of lightweight alloy plastic, 2-pack Size: Suitable for 22mm / 0.87in diameter bike handle bar It can be adjusted slightly according to the diameter of the handlebar because it is fixed by screws 21mm-25mm Features: The ringtone is loud and clear, the shape is small and exquisite, easy to install, and the position of the bell can be freely adjusted according to the habit of ringing the bell. Uses: suitable for folding bikes, mountain bikes, BMX, MTB, scooters, children, etc. Guarantee. If you have any questions or problems, please contact us first, we will reply you and solve your problem as soon as possible.