The RAM universal spring loading clamping cradle includes side clamps with rubber bumpers that adjust accordingly to the width of your device, securing your device in the cradle. The feet at the base of the cradle can pivot and slide, creating an opening for larger devices to be attached. A release button, located on the bottom right side of the cradle, allows for quick release of your device. Also included are two threaded inserts and a set of two nuts/bolts to connect the cradle to any of the RAM compatible mounts. Primary mounting applications for the clamping cradle is in LOW VIBRATION environments including cars, trucks and fleet vehicles. Common Compatible Devices: Apple iPhone 3G, iPhone 3G S & iPhone 4 Phones or devices with skins/cases/bumpers Clamping Holder Dimensions: Width Range: 1.75" to 3.5" Material: High Strength Composite