Slim Grip Apple iPhone 3G 3Gs 4 4s Vehicle Air Vent Mount, use with and without your case,fits Otterbox The Slip Grip iPhone 4 cradle allows you to keep on any protective case or skin while viewing Apple iPhone 3G/3Gs from air vent. The spring loaded retaining clips will fit devices between 80mm & 120mm. This super slim gripper style allows the most chunkiest of cases to stay on the iPhone 3G/3Gs. Crocodile style clips are easy to position & remove. Ideal for swapping from vehicle to vehicle. The cradle can be rotated through 360 degrees so the phone can be viewed horizontally or vertically