RAM Mounts X-Grip Fork Stem Kit Features 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