The Profile Design Aerodrink Bracket is designed specifically for the Profile Design Aerodrink System on aerobars that are between 65mm and 125mm wide. This bracket is NOT required for the Profile Aerodrink system if you have standard "narrow" aerobars such as the AirStryke, Split Second, Syntace C2 Ultralight, etc; however, it is highly recommended. Detailed instructions included.