Features: *Includes 2 sets of bicycle trailer hitch coupler: Each set contains 2 tools, providing enough for your daily needs or sharing with family or friends. *design compatible with most bicycles and children trailers: Suitable for QR axles and solid axles up to 12.2 mm0.5 inch. (Note: Not compatible with Breezer style dropouts) *Made of rugged steel: Ensures sturdy and firm performance, with a fine structure that resists deformation and maintains shape over time. *Functional tool for versatile use: Allows you to conveniently transport your children or pets by bicycle, promoting fast interaction and enjoyable shared experiences. *Portable and easy to carry: Compact size facilitates easy transportation in your bag during outdoor activities. Connects your ' trailer to your bike, enabling convenient mounting on the rear axle. Specifications: *Product Name:for Burley Bike Hitch Bicycle Trailer Hitch Coupler Bike Coupler Attachment *Material:Quality steel *Size:As shown in the figure *Color:As shown in the figure Package Content: Two 90 degree traction heads Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.