The kit consists of the Tough-Claw rail clamp base, short length double socket arm and universal spring loaded X-Grip cradle for phones. The spring loaded X-Grip cradle expands and contracts, allowing for a perfect custom fit of your tablet. Included are easy access grip knobs for quick insertion and release of your handheld device. The Tough-Claw rail clamp base is the perfect mounting base for quick and easy toolless installation and removal on round, square, odd shaped rails and bars. Perfectly suited for mounting on the yoke of an aircraft, handlebars and seat posts of bicycles, kayak rails, roll bars and much more.