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).