Incredibell Adjustabell 2 Bell You Rang?The Adjustabell 2's unique handlebar clamp works like a hose clamp, fitting virtually any diameter bar. A rotating dinger adjusts to any position around the dome, so you can ring it with your thumb or any finger, however feels most natural. Features Adjustable hose-clamp style strapfits handlebars from 15mm to 39mm in diameter Rotating dinger and baselet you customize striker position for the most convenient ring Spring-loaded strikerfor greater long-term durability Loud, clear, and bright soundcuts through traffic and trail noise alike Lightweight alloy constructionresists rust while keeping a true, consistent tone SPECIFICATIONSIntended Use Road, MTB, Commuting Dome Diameter34mm (1. 35")Handlebar Compatibility15mm - 39mm outside diameter Weight26g (0. 9oz) | Incredibell | Adjustabell 2 Bell Black