The RAM® Finger-Grip™ is a universal holder that can accommodate a wide range of devices including GPS, handheld radios, phones, bluetooth speakers, and much more. Included with the holder are three sets of four flexible rubber-coated fingers to grip your device. The main backing plate consists of multiple slotted holes where any set of finger grips can be positioned to hold your device firmly. When positioned correctly, your device can easily wedge in and out of the holder; suited for any rough environment. Also included are two sets of optional top and bottom supports to add even more stability to your device if needed. The RAM-B-138-UN4U also includes a medium length B-size arm and a 2.5" diameter round plate with Universal AMPS hole pattern.