Amazon.com: BRCOVAN Anti Theft Motorcycle Fork Stem Phone Mount Holder Motorcycle Fork Stem Mount Base Cylindrical Bore Wall Phone Mobile GPS BRCOVAN Aluminum Alloy Motorcycle Fork Stem Phone Mount Holder with Quad Lock Motorcycle Fork Stem Phone Mount Kit with Vibration Dampener Amazon.com: BRCOVAN Motorcycle Fork Stem Phone Mount Holder with Amazon.com: BRCOVAN Anti Theft Motorcycle Fork Stem Phone Mount Holder. 13. 3 14. 7mm Motorcycle Fork Stem Mount & Strong Grip Holder for iPhone 8 (4. 7" Screen) Cradle Clamping Dimensions: Cradle will hold phones up to 3. 9 inches wide Lipped grip means phone will stay secure in the holder. The redesigned cradle offers even greater support for larger phones in bumpy conditions. Mount; This central fork stem yoke mount has been developed for use on bikes where a handlebar mounting option is not possible or desirable. Designed to fit sports, superbike, endurance and touring motorbikes using the cylindrical bore wall (steering head tube) of the fork stems. Mount Fits Stems: 13. 3mm 14. 7mm (0. 52 inch 0. 58 inch)Light weight made from Aluminium. Attaches easily to the steering head tube of fork stems. Easy to fit and completely remo