The RAM-B-138U consists of a 2.5″ diameter round base that contains the universal AMP’s hole pattern, double socket arm and diamond base adapter. The mount is designed with a 1″ diameter patented rubber ball and socket system that has adjustment points at both ends of the double socket arm; this allowing for almost infinite adjustment and perfect viewing angles. The hole pattern found on the diamond base adapter will connect to most RAM cradles. The included RAM’s patented design dampens shock and vibration, helping to extend the life of your device. Specifications: Docking Cradle: No Locking Cradle: No Fit’s Tablet’s WITH Cases: No Fit’s Tablet’s WITHOUT Cases: Yes Low Vibration Environment: Yes High Vibration Environment: Yes Cradle Features: 1. Compatible with various iPad cable/docking accessories 2. Patent pending roller design for super smooth placement and removal of the iPad 3. High strength materials maximize longevity of cradle 4. Full access to all ports 5. Lifetime warranty 6. Made in U.S.A.