Incredibell Trail Bell Ring My Bell The Trail Bell warns hikers and other trail users that you're coming, and you don't need to take a hand off the grips to do it. When you want some quiet, flick the switch and it goes silent. One universal clamp fits mountain, gravel, and hybrid bars. Features Hands-on-grips operation, announces your presence without letting go of the bars On/off switch, silences the bell with a flick Universal clamp, fits 22. 2mm to 31. 8mm handlebars Corrosion-resistant metal construction, holds up in all weather SPECIFICATIONSIntended Use Mountain Biking, Trail Riding, Gravel Handlebar Compatibility22. 2mm - 31. 8mm Material Corrosion-resistant metal | Incredibell | Trail Bell Silver