These are simple polished stainless steel struts which can be used to mount many of our racks to your bike's brake bridge or fork crown. Available in Small and Large sizes. - Small is 8.5cm long from end to end - Useful for mounting our Constructeur Rear Rack to your brake bridge. - Useful for mounting our Constructeur Rear Rack to your brake bridge. Also used for mounting our Randonneur, Constructeur Front, and Porteur Racks to your bike's fork crown. - Note: not required if you mount the rack to metal fenders, as is traditional.