This product is designed to securely mount a bicycle on the roof of a car, providing a convenient and safe way to transport the bike without taking up any interior space. Features: 4 sizes of conversion rings. Suitable for fixing most kinds of bike. Easy to install and quick to release. Convenient and safer to transport bicycle. Made of fine quality aluminum alloy, high strength, strong bearing capacity, not easy to damage. Save space inside the car without damaging the paint of car body or bike. Note: The screws required for fixed brackets are not included. Specifications: Color: Black Material: Aluminum alloy Model 1 with quick release Size: 11*3.8*5.8cm / 4.3*1.5*2.3in Weight: 180g Package size: 16.5*7*7cm / 6.5*2.8*2.8in Package weight: 270g / 9.5oz Model 2 without quick release Package size: 13.2*4.2*8.2cm / 5.2*1.7*3.2in Package weight: 205g / 7.2oz Packing List: 1 * Bicycle Front Fork Mount Bracket Set