The RAM® X-Grip® Phone Mount with RAM® Snap-Link™ 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. KEY FEATURES Spring-loaded X design High-strength composite and stainless steel hardware Clamp to round, square, and odd-shaped rails and bars ranging from .625″ to 1.5″ Phone Width Range: 1.875″ – 3.25″ BALL/SOCKET SIZE: RAM Snap-Link (3/4″) Max Weight Capacity: 0.5 lbs. The RAM Mounts RAM-HOL-UN7-400U consists of the small Tough-Claw™ base and universal X-Grip® cradle. The X-Grip® cradle has a clean and clever four leg design that sports great holding power without hiding your smart-phone behind foam pads and plastic. The X-Grip® cradle expands and contracts for perfect fit of most smart phones. This mount rotates 360 degrees. The X-Grip® includes a device tether recommended for outdoor applications. The cradle is compatible with handheld devices that will fit the dimensions listed below. It is important to verify the dimensions of your handheld device with a case/sleeve/skin when determining the overall size.