Multi-compatible bike trailer coupler: It fits almost all bikes and all Schwinn and InStep brand trailers (such as all series AA, AB, AC AD, AE, AG, AH, AI)

Portable design: There are vertical and horizontal holes on the trailer coupler, so whatever your bike trailer coupler holes is vertical or horizontal, it works for you perfectly

Easy installation: We enclosed the great instruction with detailed pictures and descriptions in the package for your installation reference

Family fun: 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. A bonus, when your kids gets tired from riding, you can strap him next to your bike

Precise design: The diameter of the hole attach to your bike is 1/2 inches & the outer diameter of the part that attaches to the axle is 1 inch. The diameter of the hole attach to your trailers is 1 inch