The RAM® X-Grip® Large Phone Mount with Vibe-Safe™ & Fork Stem Base - Short (RAM-B-176-A-UN10-462) is a combination of the RAM® X-Grip® Phone Mount with Motorcycle Fork Stem Wedge Base and the RAM® Vibe-Safe™—our vibration damping accessory is designed to protect electronic devices from a wide range of vibration frequencies. The included fork stem wedge base is a low-profile mounting base designed to attach directly to the cylindrical bore wall of motorcycle fork stems that measure 12mm to 18.75mm in diameter, keeping your device front and center. This product comes pre-assembled with the device tether that is recommended for outdoor applications. This product comes with one (1) short B-size arm and one (1) RAM® Motorcycle Fork Stem Wedge Ball Base - 12-18.75mm, and an optional device tether that is recommended for open cockpits and outdoor applications. The holder is compatible with handheld devices that will fit the dimensions listed below it is important to verify the dimensions of your handheld device with a case/sleeve/skin when determining the overall size.