U-shaped Cycling Bike Bicycle Mountian Bike Single Speed Bike Folding Bike Rear Rack Mount Bracket Adapter Easy to install Made of high quality and durable steel Attach any rear rack to your bike Dimension(cm): 7 (L) x 1.5 (W) x 1.6 (H) Weight(g): approx 20; Package included:- Bike rear rack mount bracket x 1; - Bolts x 3