RAM Tough-Claw X-Grip Phone Mounting Kit Designed to be easily mounted and removed on round, square or other odd shaped rails / bars, the Tough-Claw can be clamped tool-less on rails from 0.625 - 1.5 outer diameter. The included X-Grip mount features a spring loaded X design that expands and constracts to secure your phone with an optional device tether for riding over rugged terrain. This combination forms a strong, flexible mounting solution for a wide variety of phones. Features Low profile phone mount clamps to your handlebar or rail with the turn of a single knob RAM Tough-Claw is designed to quickly clamp to round, square, and odd-shaped rails and bars ranging from .625 to 1.5 in outer diameter Rubber pads provide stable gripping and protection of mounting surface RAM X-Grip uses a spring loaded, rubber capped X design that provides great holding power without hiding your phone Optional device tether available to use when traversing rugged terrain Fits a wide variety of phones due to multiple sizes (see size chart below) Made of high-strength composite and stainless steel hardware for durability and reliability in the most demanding environments Tough Claw Small Clamp Base Normal phone holder Width Range: 1.875 - 3.25 Max Depth: 0.875