SM488 Mega Grip 18" Flexible Seat Rail Bolt Floor Mount for Smartphones Mobile Phones - SKU (19188)Arkon's Mega Grip smartphone mount is versatile; with adjustable side grip arms, it's designed to work with smart phones with screen size 3. 5" and up. It's the perfect holder for large phones and big cases. Adjustable legs keep bottom ports free. The 18" flexible aluminum mount attaches to your car's seat track bolt. Brackets are included for semi permanent floor mounting if desired. Mega Grip holder is adjustable for large phones and big cases 18"