Feature:1. High Durability: Bike trailer hitch coupler is made of high strength steel, with a damage resistant paint surface, ensuring durability and reliability during rough rides on mountain trails.2. Compact and Portable: This small and practical hitch coupler is easy to carry along and use whenever needed, offering convenience and flexibility for your outdoor activities.3. Easy Installation: Simply open the lock on the hitch coupler and attach it to the bike rear wheel assembly. The steel hook seamlessly integrates with the trailer pin for a secure and flexible connection.4. Practical Design: Ideal for camping trips with children or pets, this coupler allows you to effortlessly connect your bike to the trailer, making your outdoor adventures more enjoyable and convenient.5. Precise and Dependable: This coupler features a 10.3mm rear axle fixing hole, 6.6mm trailer coupling fixing hole, and a 22.4mm diameter recess for the axle nut, offering a sturdy connection for your trailer.Specification:Item Type: Trailer CouplerMaterial: SteelRear Axle Mount Hole Diameter: Approx. 10.3mm / 0.41inTrailer Link Mount Hole Diameter: Approx. 6.6mm / 0.26inAxle Nut Recess Diameter: Approx. 22.4mm / 0.88inBase Plate Length: Approx. 55mm / 2.17in.Package List:1 x Bike Trailer Hitch Coupler1 x Quick Release Buckle