Can be mounted on handlebars of φ0.9 - 1.2 inches (22.2 - 31.8 mm). O-ring rubber makes it easy to put on and take off. (No tools required). 2 O-rings (for small φ22.2, 25.4) (for large φ31.8) This bell has a high degree of freedom in the mounting position. Smart design that is easy to match with sports bikes. This is a lightweight bell weighing 16 grams. Proudly made in Japan.