This ball mount holder ball adapter rotated from 1 inch ball head to 1 inch ball head. This double ballpoint pen is compatible with ram mounts/iMESTOU B ball foot arm systems. It is a mounting kit for universal use, such as bike phone holder, camera mount, special gear extension and transmission. With this dual ball adapter you can rotate your device 360°. It converts a 1-inch/RAM B size/25.4mm mounting socket system to a 25.4mm mounting socket. It is used for Gamin GPS, bike phone holder, motorcycle phone mount or any other 25.4mm GPS mount socket.