SB packaged, for thru axle, Attachment with hexagon nut, allows compatibility of child and bicycle transport trailers and associated couplings (e.g. Thule, Weber, Hamax, Queridoo etc.) with 12 mm thru axles. Made of high-quality 7075 aluminum, black With the CONTEC Thrubee axle adapter for trailers you can quickly make your bicycles compatible with child and cargo trailers and associated couplings. The 12 mm thru axle is made of high-quality 7075 aluminum and provides a strong connection between your bicycle and your bicycle trailer from manufacturers such as Thule, Weber, Hamax, Queridoo and others. Main color black Type/type Item Version replacement / accessories