Description 100% brand new and high quality Material:Metal Hole diameter for the bike bolt: 11mm Hole diameter for the trailer's handle bar: 7mm Recessed area diameter where axle nut screws onto: 21mm Base plate length: 55mm Suitable for children's trailers and most bicycles. Usable as a convenient and safe hitch for bicycle trailers to be attached to bike's rear axle. Made of durable material,sturdy and wear resistant. Easy to assemble and storage. Decrease time needed to switch your trailer onto a new bicycle easily.Just connect with trailer towbar,then you can switch it quickl Quality is the first with best service. customers all are our friends. Fashion design,100% Brand New,high quality! Note: 1. For reasons of taking pictures, please allow slight color differences Package Included: 1 pcs railer Hitch Mount 1pcs Buckle SKU:ZXC8918 【Wide use】the bike metal attachment connector accessory is easy to install and can be applied to instep bike, pet stroller and so on, suitable for daily use and family tour use, bringing much convenience for your getting around 【Handheld and Portable】our sturdy bike coupler attachment is not too large, can be stored or carried along with you conveniently, and connect your kids trailer with your bike, you can mount it on bike rear axle Usable as a convenient andhitch for bicycle trailers to be attached to bike's rear axle.