The RAM-HOL-UN10-400-1U consists of the small RAM Tough-Claw base and universal large RAM X-Grip phone holder, connected by the RAM Pin-Lock washer. The large RAM X-Grip features an ‘X’ design that expands and contracts to secure your phone, and includes a device tether recommended for outdoor applications. With the RAM Tough-Claw base connected, easily attach the RAM X-Grip on round, square, and odd-shaped rails and bars ranging from .625” to 1.5” in outer diameter. This kit is compatible with handheld devices that will fit the dimensions listed below. It is important to verify the dimensions of your handheld device with its case, sleeve, or skin when determining the overall size.