What you will get: Comes with 2 sets of bike trailer hitch hitch, each set counts as 2 tools, enough to meet your daily needs or share with family or friends Universal design: our bike coupler hitch is suitable for QR axles and solid axles up to 12.2 mm/ 0.5 inch, suitable for most children's bikes and trailers; Note: Not compatible with Breezer style dropouts Sturdy and durable material: the bike trailer hitch is made of quality steel, strong and firm, not easy to deform or deform, with fine structure, durable for a long time using Functional Tool: With our bike coupler tether, you can pick up your son or daughter and pets on the bike and enjoy this quick interaction , and have a great time riding together Portable to Carry: This sturdy bike hitch accessory is not big, you can easily carry it in your bag for outdoor activities, connect your child trailer to your bike, you can mount it on the rear axle of the bike