Wheelchair U-Bolt Mount with Double Socket Swivel Arm and X-Grip Universal Phone Holder for iPhone XS MAX (sku 42844)Wheelchair U Bolt Mount with Double Socket Swivel Arm and X Grip Universal Phone Holder for iPhone XS MAX. The X Grip Holder has a clean and clever rubber tipped four leg design and 1" rubber ball on the back. It sports great holding power without hiding your mobile device behind foam pads and plastic, Suitable for the iPhone XS MAX The Double Socket Swivel Arm consists of double 1" diameter open ball sockets with a 360' rotation point at the center