SB-packed, for thru-axle, Attachment with hexagon nut, allows compatibility of child and bicycle transport trailers and associated hitches (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 make your bikes compatible with child and cargo trailers and their hitches in no time. The 12 mm thru-axle is made of high-quality 7075 aluminum and provides a strong connection between your bike and your bike trailer from manufacturers such as Thule, Weber, Hamax, Queridoo and others. Main color black Type/kind Item Design replacement / accessories