Lezyne Classic Brass Bell - Hard Mount, BlackClassically designed bicycle bell featuring modern materials and a robust machined aluminum handlebar mount. The bell dome and striker are crafted from high quality brass with a sturdy stainless steel spring. Its secure base quickly mounts to most modern bicycle handlebars (25. 4 mm or 22. 2 mm diameter) with a stainless steel Torx bolt. And its narrow design attaches neatly between other handlebar accessories.