Features:Fix tightly onto the seat post of your bicycle.Suitable for mountain bike and road bicycle whose seat post diameter is less than 31mm.Length can be adjusted by two inner hexagon screws. (38cm ~ 64.5cm)Adopt high-strength aluminum alloy material， durable and sturdy.Quick installation and removal.Specifications:Color: BlackMaterial: Aluminum alloyMaximum loading: Approx. 10kgSize: Approx. 38cm * 11.8cm * 10cm / 15.0 * 4.6 * 3.9inWeight: Approx. 610g / 1.34lbNote:Color of the clip may differ due to product stock， but it has no impact on the quality.Package Included:1 * Bicycle Rack