Features: 1 Made of heavy-duty steel with a welded hitch arm at an approximate 45-degree angle for ideal attachment position for many types of bicycle trailers. 2 Attaches to the bicycle rear axle with the rear axle nut. 3 Usable as a convenient and safe hitch for bicycle trailers to attach to. 4 It fits almost all bikes and all kinds of trailers. 5 With an additional trailer coupler attachment, both Mom and Dad's bikes can be outfitted to tow the kids trailer, your kids will enjoy the bike ride. Specifications: Type:Trailer Hitch Mount Material:Steel Hole diameter where axle attaches:11mm Color:Black Recessed area diameter where axle nut screws onto:21mm Hole diameter in hitch where the trailer attaches:6.8mm Base plate length:55mm Package included: 1x Trailer Hitch Mount and Lock Ring 1. Made of heavy-duty steel with a welded hitch arm at an approximate 45-degree angle for ideal attachment position for many types of bicycle trailers. 2. Attaches to the bicycle rear axle with the rear axle nut. 3. Usable as a convenient and safe hitch for bicycle trailers to attach to. 4. It fits almost all bikes and all kinds of trailers. 5. With an additional trailer coupler attachment, both Mom and Dad's bikes can be outfitted to tow the kids trailer, your kids will enjoy the bike ride.