Thanks to the TWIST bike base, bottle cages are now outdated. Even smaller bike frames can now be fitted with a water bottle thanks to the magnetic system without a bottle holder. Moreover, with its flat and compact design, it integrates perfectly with the bike frame without being obtrusive. Fidlock - TWIST bike base (magnetic base for Fidlock water bottles). The magnetic water bottle holder easily attaches with two screws to all standard bicycle mounting holes. Compatible with all standard threaded bottle holder inserts. Weighs only 16 g / 0.56 oz. Compatible with all TWIST modules.