The Burley Steel Trailer Hitch provides the critical connection from your Burley Trailer to your bicycle. The hitch installs easily on the rear skewer of your bike, and then stays attached so the Burley can be connected at any time. If you'd like to swap the Burley from bike to bike, pick up a couple spare hitches and install them on the extra bikes so the hitch doesn't need to be un-installed when swapping bikes.