Bicycle Hitch Adapter for Pet Trailers - Bolts directly to the rear bicycle wheel nut allowing a pet trailer to be attached. Designed for use with pet trailers such as the Pet-Trailer-1 . Includes a pre-drilled hole for quick-clip attachment. Fast install, easy to use. Steel construction with a gray powder-coat finish. * Bolts directly to the rear bicycle wheel nut allowing a pet trailer to be attached * Designed for use with the Pet-Trailer-1 Bicycle Trailer * Pre-drilled hole for quick-clip attachment * Installs quickly and is easy to use * Steel construction with a gray powder-coat finish