Specification: Color: Black Material: Metal Size: 7.5 x 7.5 x 3 cm Applies to: Bicycle Baby Pet Trailer Equipment >Package Included: 1 x Trailer Tow Head High Quality Material: The bike trailer hitch is made of high quality steel, solid construction, durable and strong. It is coated with powder paint, so it can blend perfectly with your bike even when no trailer is connected. What you get: come with 1 piece bike hitch and quick release skewer, convenient for you to use; Fits most types of bikes, such as mountain bikes, folding bikes, road bikes, etc. Compatibility: The bike trailer hitch fits QR axles and solid axles up to 12.2mm (OD 0.5 inch), black color. The universal design can be used with conventional bikes as well as disc brake and full suspension models. Easy Installation: Just to make sure it doesn't rotate when tightened. Insert a wrench through the pin hole and hold it in place while tightening. Easy to install in minutes. Ideal for Family Use: Enjoy the joy and excitement of transporting your kids or pets on your bikes. You can spend wonderful family time with your kids.