For thru-axle, enables compatibility with THULE child trailer with 12mm thru-axle, thread length 20mm ezHitch adapter for thru-axles With the THULE thru-axle adapter, an "ezHitch" trailer hitch for THULE child bicycle trailers can be mounted on bicycles with 12 mm thru-axles on the rear hub. Variants for Shimano, Syntace and Maxle are available in different lengths. Tip: It is best to discuss the correct dimensions of the adapter with your specialist dealer. Main color black Coupling system axle mounting Secondary color silver Type/kind Accessories