The universal holder has flexible rubber-coated fingers to provide a secure grip of your device. You open fingers simply by squeezing their ends. The holder provides three sets of four rubber-coated fingers, which are suitable for devices of different sizes, as well as the top and bottom supports of optional devices. It is compatible RAM® Mounts B and C size diamond ball bases for attaching to double socket arms and mounting bases. Features:Height Range: 18.42 cm max (using optional supports)Width Range: 3.18 cm - 8.89 cmMax Depth: 3.81 cmHole pattern: (3) 4-Hole AMPS: 3 cm x 3.80 cmMaterial: High strength compositePackaging type: Poly BagWeight: 0.2 KgPackage content:Assembly Hardware(2) #8-32 x 1.27 cm Machine Screws(2) #8-32 x 1.59 cm Machine Screws(2) #8-32 x 1.91 cm Machine Screws(2) #8-32 Nylock NutsMade in: United Kingdom