Spring-loaded holder features adjustable side supports overmolded with a soft rubber and integration vibration damper; easily insert and remove your phone with one hand Includes U-bolt base that accommodates rails from .5" to 1.25" in diameter and a short length, B size RAM double socket arm; ball and socket technology allows for near-infinite adjustability Center cavity compatible with Apple MagSafe puck; non-slip cover and puck adhesive included Comes with optional device tether for open cockpit environments Backed by a lifetime warranty The RAM Quick-Grip Pro Vibration Damping Phone Mount with U-Bolt Base (RAM-B-149Z-A-PD5VU) is an ideal handlebar solution featuring the next evolution of the RAM Quick-Grip series with an integrated vibration damper. Re-designed with a new, sleek look and integrated rubber side arms to provide a secure, no-slip hold on your phone. This phone holder features an integrated cavity for an Apple MagSafe puck, allowing you to turn the phone holder into a wireless charging solution. Not interested in charging? No problem! The included anti-slip cover ensures a flush fit when the Apple MagSafe puck is not installed. The RAM Quick-Grip Pro features a spring-loaded design that allows easy one-handed insertion and removal of your phone. The adjustable side arms ensure that your phone will remain secured in the holder without blocking any ports or buttons. Complete the solution by building your mount—this holder is RAM Compatible and includes a B size pin-lock ball. RAM recommends installing the provided device tether when this holder is used in a vehicle with an open cockpit. This kit includes zinc-coated handlebar U-Bolt base that accommodates rails from .5” to 1.25” in diameter. It is important to verify the dimensions of your handheld device with its case, sleeve, or skin when determining the overall size.