The Kid Trailer Thru Axles allow users to attach a "hitch mount" style trailer, to any thru-axle equipped bike. Machined and tested in the USA, the Kid Trailer axles are designed for maximum strength and ease of use. Features: For use with hitch mount style trailers common with child carriers such as Thule/Chariot, Burley, InStep, Croozer and more Stainless steel axle end provides an M10 x 1 threaded stud that accepts any hitch from popular trailers Trailer hitch is NOT included Customers will use hitch provided by trailer manufacturer Installed or removed using a 5mm Allen wrench Designed, built and quality tested in the USA Specifications: Front Rear: Rear Axle Length: 169mm, 175mm or 183mm Axle Thread Pitch: M12 x 1.0