Features a B-sized 1in. rubber ball mounting base that accommodates handlebars 3/4in. - 1in. in diameter paired with the dynamic X-Grip for phones Sizing inserts included to provide a snug fit and offer additional protection for the rail Low-profile mount utilizes nylon-insert locknuts to secure personal electronics and small accessories to prevent loosening in high-vibration environments Included spring-loaded, X-Grip cradle has a clean and clever four-leg design that provides great holding power without hiding your phone; X-Grip cradle expands and contracts, allowing for a perfect custom fit X-Grip also includes a device tether recommended for outdoor applications Cradle is compatible with handheld devices that will fit the following dimensions: minimum width of 1.875in. with a minimum height of 4.25in.; maximum width of 3.25in. with a minimum height of 2.25in.; depth of 0.875in. NOTE: It is important to verify the dimensions of your handheld device with a case/sleeve/skin when determining the overall size.