The RAM-B-176-A-UN7U consists of a fork stem base, short double socket arm and universal X-Grip™ holder. The mount is designed with a RAM 1" diameter patented rubber ball and socket system that has adjustment points at both ends of the double socket arm; this allowing for almost infinite adjustment and perfect viewing angles. The included 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. The spring loaded X-Grip™ holder expands and contracts, allowing for a perfect custom fit of your cell phone. This one of the cleanest ways to mount small electronics on your motorcycle. Simply slide the assembly into the hole of the stem and tighten the machine screw to create a tight fit. This part is designed to fit into the cylindrical bore wall of fork stems and will work with stems that measure from 12-28mm or .5” – 1.10” at the following intervals: