Universal Bike Bicycle Trailer Coupler Attachment, Bike Trailer Hitch Linker Connector, Cycling Adapter Accessories for Child/ Pet Cargo Bike Trailers With the complete hitch arm and hitch connector, easy to install without other tools required. Each bike trailer coupler has equipped with a connect pin, the pins can hardly get opened, also once you install them up, they not easily fall off, can your babies safety Bike Trailer Coupler Hitch is a practical bike trailer hitch for towing solutions, stretches easily to allow user to lay down a bike while the trailer remains upright Color:Black Material:Metal Package Contents: 1 * Bike Trailer Coupler Attachment Hitch Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.