SPSCW25 is a 25mm ball adapter with a female 1/4"-20 threaded hole. The adapter is compatible with devices having a 1/4"-20 screw bolt pattern and tripods with a male 1/4"-20 screw mounting bolt. SPSCW25 fits onto mounts accommodating the 25mm (1 inch) ball pattern (including selected Arkon Robust Mount models and RAM Mounts Size B-sold separately). This package includes only the 25mm Ball Adapter with 1/4"-20 Female Threaded Hole. (Mounts, holders, and devices sold separately.)