Dedicated Bicycle Bike Head Stem Mount Holder for Apple iPhone 6S (4.7) Bicycle Head Stem mount with a dedicated clip-in phone cradle for Apple iPhone 6S (4.7) Suitable for most bicycles - fits 1 inch (28.6mm) Star Washer bike stems - not suitable for Quill Stems. Quick and easy to attach - simply remove the existing head stem cap on the bike and replace with the mount - single screw fitting. The secure dedicated clip-in cradle only fits the Apple iPhone 6S and will not accommodate the use of an additional protective case or skin. Cradle connects to the mount with a 4-prong layout and a spring release button enables the holder to be attached and removed with ease.