Consists of a fork stem base, short double socket arm 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 phone behind foam pads and plastic Expands and contracts, allowing for a perfect custom fit of your cell phone Includes a device tether recommended for outdoor applications Designed to fit into the cylindrical bore wall of fork stems and will work with stems that measure from 12 - 33mm (0.5" - 1.29") Minimum Width = 1.875" (Minimum Height = 4.25") Maximum Width = 3.25" (Minimum Height = 2.25") Depth = 0.875"