The topeak fixer f77 mounts to your seat post to allow quick and secure attachment of topeak wedge bags or an extra water bottle cage this mount will fit most seat posts and will attach all topeak quickclip wedge bags the simple angle allows a proper adjustment for a great fit for any bag topeak fixer f77 quickclick mount for seatpost features one size fits most seat posts and all topeak quickclip wedge bags simple angle adjustment allows a proper fit for any bag stainless steel seat po