Saient Bicycle Rear Racks Steel Trailer Hitch Mount Rear Carrier Mount

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
A：Single traction head
B：Traction head + silver lock ring