Need a third or fourth "gripper" arm on your Universal Phone Holder? These are the same rubber-cushioned side arms that come on our phone holder and can easily be snapped into the same track as the original arms to provide additional grip points. Especially helpful if you need to avoid buttons on the side of your phone. Easy to install, just push them straight into the grooves on the sides of the phone and they will snap into place. Then slide them up and down to position as needed. Package of two. Also fits the phone holder that comes with the PortaGrip windshield mount.