The RAM Vibe-Safe Adapter for 2-Hole Holders (RAP-462NPT) is a vibration damping accessory designed to protect electronic devices from a wide range of vibration frequencies. The RAM Vibe-Safe is based on an NPT connection point and boasts the versatility to rotate between portrait and landscape while keeping your device secure in rugged environments. This adapter is compatible with most 2-Hole RAM Holders, including the RAM Quick-Grip, RAM Tough-Charge, RAM Quick-Charge & RAM Form-Fit Holders. The RAM Vibe-Safe is only compatible with the metal diamond ball adapter (RAM-B-238U).