Part No. 219169 RAM EZ-Strap™ Rail Mount with Universal X-Grip® Cell Phone Cradle 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/skin when determining the overall size.