The iron hitch provides the critical connection from your trailer to your bike. The hitch installs easily on the rear skewer of your bike, and then stays attached so can be connected at any time. If from bike to bike, pick up a couple spare hitches and install them on the so the hitch doesn’t need to be un-installed when swapping bikes. The steel hitch will fit most bikes out of the box, but if you have a or another unusual setup, you may require an adapter. Features - Color: Black. - Material: Iron. - Size: 7.50 x 5.50 x 3.00cm/ 2.95 x 2.16 x 1.18 inch. - Made from iron material, with black printed surface, hard, wear resistant and durable, owning long using life span. - The replacement coupler can be used as a convenient hook for connecting the bike trailer to the bikes rear axle. - The product comes with a buckle to ensure the stability of connection. - The trailer coupler is easy to be installed by screws, no complex installation process. - The trailer coupler is compact and effective, not occupying much installation space. - With an additional coupler attachment, 2 bikers can tow the trailer in turn and don’t need to exchange the bikes they ride. Package list: 2 x traction adapters