Included with the cradle is three sets of clamping arms. The arms contain rubber tips for an optimum hold The arms can be easily removed and changed so you can find the right clamping hold for your device. This cradle is designed to hold the following devices:PDA devices and other electronic devices Length sizes for each set of three arms: Short Length: 1/2"Medium Length: 7/8"Long Length: 1 3/16" Cradle Clamping Dimensions: Width: 2 7/8" - 3.5"Thickness: 3/8" - 1 1/8" Material: High Strength Composite Note: The "U" in the part number reflects product packaged in poly bag. If this product is used for motorcycle applications insure that the mount is tethered and secured. Product : RAM MOUNT UNIVERSAL 3 FINGER HOLDER Manufacturer : RAM MOUNT Manufacturer Part No : RAM-HOL-PD2U UPC : 793442901225