West Biking Cycling Bike Bicycle Bell Bells for MTB Road Bikes Safety Riding Bicycles Alarm Horn Warning Ring 1.Bell Brass Duet Bicycle bell has a solid brass dome. 2.The 25.4 milli meter clamp fits most handlebars. 8.It comes with trigger-pull lever. 4.Dome Diameter: 33 milli meter (1.3-Inch). 5.Fits handlebars with 21.7 milli meter - 24 milli meter (.86-Inch - .95-Inch) outside diameters.