Suitable for installation to handlebars and rear-view mirror frame or other round rails within the stated dimensions. Package come with three soft rubber ring inserts to provide a snug fit and protection of the mounting surface. Rubber ring inserts diameter: 0.5''(12mm), 0.87''(22mm), 1''(25.4mm). You can add or remove rubber ring according to the diameter of handlebar. When the rubber ring insert is not embedded, the hole diameter of the handlebar mounting base is 1.26" (32mm). So the handlebar mount base compatible with handlebars 0.5 inch (12mm) / 0.87 inch (22mm) / 1.0 inch (25.4mm) / 1.26 inch (32mm) in diameter.
Suitable for installation on bike, bicycle, motorcycle, stroller, mountain bike, dirt bike, trek bike, road bike, golf cart, electric scooter, ATV, etc.