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), works with Burley bicycle trailers, disc brakes and fully sprung models. (NOT suitable for Breezer-style dropouts; Flex connector NOT included). Premium Material: Bike Trailers Adapter is made of high quality steel. It has a solid construction coated with powder paint and your bike, even if it does not have trailers. Aasily Install: Make sure the trailer spare connector does not rotate during tightening, and throw the Allen key through the needle hole, holding it in place by tightening. Safety: The replacement connector on this trailer has no sharp edges, so it wont scratch your hand or hurt your children, dont worry when using it. Trailers Mounting only, other image accessories demo not included Specification: Material: Steel Size: app.5.85x5.7x3cm / 2.30x2.24x1.18in Color: Black and silver Quantity: 1 Set Package Contents: 1 Set x Trailers Attachment