Features:Fix tightly onto the seat post of your bicycle.Suitable for mountain bike and road bicycle whose seat post diameter is less than 33mm.Adopt high-strength aluminum alloy material， durable and sturdy.With a elastic rope to help fasten your luggage.Quick installation and removal.Specifications:Color: BlackMaterial: Aluminum alloyMaximum loading: Approx. 8kgPackage size: Approx. 45 * 12 * 9cm / 17.7 * 4.7 * 3.5inPackage weight: Approx. 737g / 1.63lbNote: Please allow 1-2cm (0.4-0.8") differences due to manual measurement， thanks.Package List:1 * Bicycle Rack2 * Pad