The SP142038MM adapter allows you to convert your existing 1/4”-20 compatible camera mount, tripod, or monopod into a heavy-duty 38mm smartphone or tablet mount. This adapter is compatible with all mounts, tripods, and monopods utilizing the 1/4”-20 screw bolt pattern. (Mounts, holders, and devices sold separately.) Screw the adapter onto the 1/4”-20 threaded bolt, then mount one of Arkon's 38mm (1.5 inch) double-socket Robust Mount shaft arms or other compatible adapters or mounts onto the 38mm ball. This adapter can also be used to work with compatible RAM Mounts Size C arms or other third-party mounts utilizing the 38mm ball pattern. Also works with camera mounts having a fixed 1/4”-20 screw bolt.