SP25MMSCW is a 25mm ball adapter with a female 1/4"-20 threaded hole and included 2.25 inch hex post. This unique adapter can be used as either a 1/4"-20 female or male depending on your needs. Compatible with devices having a 1/4"-20 screw mounting pattern and tripods with a male 1/4"-20 screw mounting bolt, SP25MMSCW is compatible with mounts accommodating the 25mm (1 inch) ball pattern (including Arkon's Robust Mount models and 1-inch RAM Mounts-sold separately). This package includes only the 25mm Ball Adapter with 1/4"-20 Female Threaded Hole and Hex Post. (Mounts, holders, and devices sold separately.) To use the adapter as a female threaded hole adapter, simply unscrew the hex post from the adapter.