AVAWO Rifle Bipod Sling Swivel Stud Mount and Picatinny Mount Adapter Heavy-duty metal & aluminum construction to meet harshest requirements. Clever dual mounting - Picatinny mount and swivel stud mount. Supported by lockable thumb wheel for fine and precision adjustment. Unique non-slip rubberized foot pads for any terrain or surface. Fits all Standard 20 mm Picatinny Rail.