NOTEPlease read carefully before purchasing. 1. The length of clamp BETWEEN 0.5-1.14IN. This vent car phone holder NOT COMPATIBLE WITH CIRCLE AIR VENT. 2. We recommend using the smaller phone(4.7 IN) with phone caseMaximum thickness of device is 14MM(0.5 IN) 3. Please kindly know the car mount only supports VERTICAL MODE THE EASIEST OPERATION & JUST SLIDE IN AND GO: Just slide in your phone, car vent phone mount holder clamps the phone automatically by gravity and provide the easiest operation and a strong stable hold without button to press. Compaired to old air vent phone holder for car , you no longer free hands to spend too much time in looking down to place phone while reseting the navigation route. When getting off car in a hurry, just pick up phone and leave in seconds. UPGRADED AIR VENT HOOK: This car vent phone holder mount is designed as "Hook shape" and form "Three grasp points" which can firmly hook around the a/c vent for no slippage or movement. Th