Top-bike Bell Ring Aluminium Alloy Emergency Alarm Bike Handlebar Bell New Compass Design Made of premium qulity durable Aluminium Alloy material. Unique Compass design for decoration. Easily attaches to your handlebars and easy to use - press the pad, release immediately. The metal bell has a screw attachment to fit on to the handle-bars, and the bell itself is loud and clear. Adjustable Size: suitable for about 22mm handlebar in diameter(screw adjustable).