Features1Made from high-strength alloy material, weather-resistant and durable. 2Securely locks your helmet on the handlebar of your motorcycle, bicycle or scooters. 3Includes 2 keys, hex wrench, and rubber gasket, easy to install. 4Fits 20-26mm (simple version) / 20-28mm (upgraded version) handlebar diameter.SpecificationFeatures:Made from high-strength alloy material, weather-resistant and durable.Securely locks your helmet on the handlebar of your motorcycle, bicycle or scooters.Includes 2 keys, hex wrench, and rubber gasket, easy to install.Fits 20-26mm (simple version) / 20-28mm (upgraded version) handlebar diameter.Specifications:Type: Simple version / Upgraded version (optional)Simple version:Material: Aluminum alloyFits Handlebar: 20-26mmUpgraded version:Material: Strengthened zinc alloyHandlebar: 20-28mmPackage List:1 * Lock2 * Key1 * Hex Wrench1 * Rubber GasketPackage List1 * Lock2 * Key1 * Hex Wrench1 * Rubber Gasket