This universal Bike Coupler / Hitch is used to connect Soozier brand bicycle trailers to your bike. With this, you can simply switch your trailer among various bicycles quickly and easily- Universal Bike Coupler / Hitch to connect Soozier brand trailers with your bike. - These hitches are a great item to have to make switching your trailer among various bicycles quick and easy! - Simply attach the coupler to your rear bike wheel - Use with Soozier Bike Trailers and other similar looking bike trailers - This coupler is designed to fit certain models of Soozier bike trailers only we cannot guarantee that it will fit any other brand.Our type 'B' coupler fits the following Soozier bike trailers: - Fits for B4-0008,B71-020,B71-005,5663-1336 - Tube Size:Φ0.5"x1"L - Connect Panel Size:2.2"L x 1.1"W x 0.25"T