1. 【Practical Bicycle Trailer Accessories】: Yangfei bicycle trailer accessories are suitable for most bicycles and can be used to connect baby strollers, dog strollers and other tools, allowing your children, dogs and you to enjoy the beautiful scenery. 2. 【Universal】: The diameter of the bicycle hook is 1 cm, suitable for all types of bicycles, mountain bikes, touring bikes, etc. 3. 【Excellent Quality】: The bicycle trailer hook is made of high - quality steel, which is strong and durable, rust - proof and corrosion - resistant. The black strap is made of high - quality nylon, very strong, and can play a double - protection role, making your trailer riding safer. 4. 【Make Your Ride More Fun】: With the attached bicycle trailer, you can take your pets, children or luggage with you when you go out, so your journey won't be lonely! 5. 【Easy to Install】: Remove the black iron block, pass the shaft through the round hole of the iron block, lock it on the rear wheel quick - release device, finally wrap the seat belt around the chain and hook the buckle on the hook - shaped buckle D. 6. Product Description: ---Yangfei Bicycle Trailer Hook---ღ Don't let yourself ride alone. Ride safely and have endless fun! 7. How to Connect the Bicycle and the Trailer? - Remove the black iron sheet from the crank. - Pass the shaft through the round hole of the iron sheet and lock it on the rear wheel quick - release device. - Wrap the seat belt around the chain stay and hook the buckle on the hook - shaped buckle D.