Optional tether included. The RAP-SB-187-UN7U consists of the RAM EZ-Strap base, double ball short arm, and universal X-Grip cradle. The strap can be cut to fit tubing, square rails, and irregular shapes from 0.5" to 2.58" in diameter. Multiple adjustment points allow you to move the universal X-Grip cradle to your optimum viewing position. This mount rotates 180 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, or skin when determining the overall size. Cradle dimensions: Minimum width = 1.875" (Minimum height = 4.25"), Maximum width = 3.25" (Minimum height = 2.25"), Depth = 0.875".