Steel Bicycle Trailer Coupling 29mm Hitch for Kids Stroller Cargo Bike Easy Installation Features： 1、STEEL CONSTRUCTION: The bicycle trailer coupling is crafted from premium steel material with high hardness, featuring a paint finish for rustproof. This ensures durability and reliability, even when navigating bumpy terrain or rough mountain roads, without worry of deformation 2、SMALL AND PRACTICAL: The compact size of the bicycle trailer hitch coupling makes it highly portable and convenient. You can easily carry it with you for on the go use, adding to its practicality and versatility. 3、EASY INSTALLATION: With a user friendly design, installation of the bike trailer coupler is effortless, open the lock on the bicycle trailer coupling and attach it to the bicycle rear wheel assembly. The steel hook can be easily integrated into the trailer pin and flexible connector. 4、ESSENTIAL FOR TRAVEL: The trailer hitch coupling serves as a crucial accessory for your travel adventures. Whether you're planning a camping trip with your children or pets, the connector allows you to effortlessly attach your bike to the trailer, enabling smooth and convenient travel experiences for all. 5、DEPENDABLE AND CONVENIENT: Offering a combination of sturdiness, ease of use, and portability, the bicycle axle coupling is a functional companion for outdoor excursions. Its practical design and dependable performance make it a must have accessory for cyclists. Specification： Item Type: Trailer Hitch Coupler Material: Steel Axle Mounting Inner Diameter: Approx. 10.7mm / 0.4in Package List： 1 x Trailer Hitch Coupler 1 x Quick Release Buckle