The RAM-B-246-3-UN4U consists of a 3 clamp base with 1 ball, a standard double socket arm and a RAM Composite Universal Finger Grip holder. The clamp and base will wrap around a maximum width of 3 and is tightened by screwing the two plates together with the included nuts and bolts. brbrRubber ball and socket technology dampens shock and vibration as well as allows for almost infinite adjustment. The holder comes with (3 sets) of four flexible rubber coated fingers place along sides to grip your device. brbrThis mount is designed to hold the following devices:Cell Phones (check measurements below for dimensions)2-Way RadiosGPS DevicesbrWorks with OtterBox (Defender, Commuter, Impact) Cases, Phones with Bumper, Twisted Metal Case and MorebrHeight Dimensions:Minimum with Top and Bottom Plates: 5.25"Maximum with Top and Bottom Plates: 6.0"The top and bottom plates can be removed for larger devices.