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 Material: The bicycle trailer hitch is made of steel, solid construction, durable and sturdy. It is powder coated so it blends perfectly with your bike even when there is no trailer attached. What you get: come with 1 piece bike clutch 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 twist when tightening. Insert a wrench through the pin hole and hold it in place while tightening. Easy installation 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. Note: 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. Sold by-YJL official store