A traditional bell with a contoured adjustable dinger arm for easy operation with the flick of the thumb. Features: Can be mounted on either left or right side of handlebars Dinger arm can be rotated to desired position for comfort and ease of use Dome Diameter: 45mm (1.8") Fits handlebars with 22 - 25.4mm (0.86- 1") outside diameters Weight: 68g (2.4oz) Specs: Mount LocationHandlebar Bar Clamp Diameter (mm)22 - 25.4