Bicycle Steel Towbar Wheel Towbar Coupling for Burley Trailers Features: Universal Application: The steel bracket is suitable for QR axles and fixed axles up to 12 mm (OD = 0.48 inches), compatible with Burley bicycle trailers, disc brakes and fully sprung models. (Not suitable for Breezer-style dropouts; flex connector not included). Premium Material: The bike trailer adapter is made of high-quality steel. It has a solid construction coated with powder paint, designed to fit securely on your bike. Easy Installation: Ensure the trailer spare connector does not rotate during tightening. Insert the Allen key through the hole and hold it in place while tightening. Safety: The replacement connector has no sharp edges, helping to prevent scratches or injuries during use. Trailer mounting hardware included only; other accessories shown in images are not included. Specifications: Material: Steel Size: Approx. 5.85 x 5.7 x 3 cm / 2.30 x 2.24 x 1.18 in Color: Black and silver Quantity: 1 Set Package Contents: 1 Set x Trailer Attachment