Amazon.com: BRCOVAN Anti Theft Motorcycle Fork Stem Phone Mount Holder Universal fork stem yoke smartphone bracket for 17mm hole Moto Discovery Amazon.com: iMESTOU Waterproof Motorcycle Fork Stem Phone Mount Case 1 Amazon.com: BRCOVAN Motorcycle Fork Stem Phone Mount with Vibration Quad Lock Motorcycle Fork Stem Phone Mount BDLA Motorbikes Amazon.com: BRCOVAN Anti Theft Motorcycle Fork Stem Phone Mount Holder. 15 17mm Motorcycle Fork Stem Mount & Strong Grip Holder for iPhone X 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: 15 17mm (0. 59 inch 0. 68 inch)Light weight made from Aluminium. Attaches easily to the steering head tube of fork stems. Easy to fit and completely removable.