Our bike trailer hitch coupler attachment is made of high-quality steel material, rustproof, corrosion resistant, not easy to break, bent and deform, making it a good choice for your travels. This product fits most mountain bikes and road bikes, making it a must-have accessory for family cyclists. And, suitable for various types of pet trailers, cargo trailers and child trailers. These trailer couplers are designed to stay securely attached to your bike, preventing accidental detachment while riding. Each bike trailer coupler comes with a connect pin, the pins can hardly get opened, ensuring your baby's safety during rides. Through this coupler hitch attachments, your bike can be equipped with a towing trailer for your child to enjoy riding. One-piece design for easy connection and time-saving. Description: Introducing our bike trailer hitch coupler attachment, the perfect solution for connecting your bike trailer to your bicycle. Each bike trailer coupler comes with secure connecting pins that are difficult to open, ensuring the safety of your baby during rides. Once installed, they won't fall off easily, providing peace of mind for parents. Made from high-quality steel with a black enamel coating, our bicycle trailer coupler is sturdy, durable, and corrosion-resistant. It is designed to withstand heavy-duty use and is not easily damaged. This additional trailer coupler attachment allows for easy switching between bikes. Plus, when your little one gets tired of riding, you can strap them next to your bike for added convenience. Through this coupler hitch attachments, your bike can be equipped with a towing trailer for your child to enjoy riding. Versatility is another key feature of our bicycle trailer coupling. It is compatible with all types of bicycles, allowing you to use it with ease. Item Name: Bike Coupler Hitch Material: Steel Features: Rustproof, Easy Installation, Corrosion Resistant Size Details: Bike Rear Axle Fixing Hole Diameter: 1.1cm/0.43" (Approx.) Connecting Trailer Fixed Hole Diameter: 0.7cm/0.28" (Approx.) Diameter of the Tightened Nut Concave Area: 2.1cm/0.83" (Approx.) Bottom Plate Length: 5.5cm/2.17" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 2 x Bike Coupler Hitches 2 x Buckles