Mercury - ROKK Universal Phone Clamp Device Holder 8M6005674. OverviewThis ROKK Universal Phone Clamp gives you a solid, no-nonsense way to hold your phone, handheld GPS, or other small devices while you're on the water. The ratcheting grip locks in tight without rattling or slipping, even when the boat hits chop. Paired with the ROKK Mini Mount System, it becomes a clean, secure setup that keeps your device right where you need it-visible, stable, and out of the way.. Key Features • Ratcheting