other Instruction: Used for pet trailer, bicycle trailer or baby trailer and stroller. For use with certain models of Aosom brand trailers only. Simple to Use: With this extra hitch, you can do the exchange in less than 30seconds. Allows for quick and easy detachment of trailers. Premium Material: Made of carbon steel with powder coating, durable and sturdy, it has great bearing capacity. Have Fun: Use this connector to get your bike equipped with the trailer and have lots of fun with your family. Product Information: Tube Size:Φ0.5"x1"L. Connect Panel Size:2.2"L x 1.1"W x 0.25"T. Before your purchase, please check your trailer whether fits it