Casotec Air Vent Car Mount Cradle For 4-5.5 Inches Smartphones, GPS - Black Casotec Air Vent Car Mount Holder Holder is designed to set on car air vent and easily adjust cradle horizontally or vertically. Just attach this holder on to any air vent and insert your phone. It's that simple. It weighs less than an ounce and makes the perfect companion for everyday use, vacations and business trips.