1、MULTI COMPATIBLE BIKE TRAILER CONNECTOR: Suitable for almost all bikes and all for Schwinn and for InStep brand trailers(e.g. all series AA, AB, AC AD, AE, AG, AH, AI)2、PORTABLE DESIGN: There are vertical and horizontal holes on the trailer connector, so whether your bike trailer connector hole is vertical or horizontal, perfect for you3、EASY INSTALLATION: The bike trailer coupler is easy to install and is an important replacement parts and accessories4、FAMILY FUN: With additional trailer connector accessories, both mom and dad bikes can be equipped with towed kids trailers, and your kids will enjoy riding their bikes. As an added bonus, when your child gets tired of riding, you can strap his bike next to the bike5、ACCURATE DESIGN: The hole that the bike trailer attachment attaches to the bike has a diameter of 1/2in and the outer diameter of the part that attaches to the axle is 1in. The hole in the trailer is 1in in diameter