The RAM-B-121-UN8U consists of a yoke clamp base, double socket arm system and universal spring loaded X-Grip cradle for 7"-8" tablets. ^^ Yoke clamp base will fit rails from 0.625" to a maximum of 1.25" ^^ Made of powder-coated, marine-grade aluminum and high-strength composites for durability and reliability in the most demanding environments ^^ Backed by a lifetime warranty