Usage Tips:"The bike trailer hitch accessory made of heavy Steel and Iron with black enamel coating, corrosion resistant, not easy to damage. Easy to Use L bike trailer hitch designed for towing solutions and easy to install Installation requires removing the nut from the bolts on the rear wheel and attaches to the rear axle of the bike with the axle nut back. Ensure Safety The bicycle trailer coupler is equipped with a connection pin, the pins can hardly be opened, also once you install them, they are not easy to fall off and can keep your baby safe.that you can easily and quickly enjoy a wonderful outdoor ride. Quick ChangeReduce the time it takes to easily change from the trailer to a bike.It can be replaced quickly by simply connecting the trailer hook. Widely Used The bicycle trailer couplings are suitable for most bicycles, dog trailers, strollers, trailers, etc."