The unique Quick Detachable (QD) design stops the metal swivel body from contacting the gun. The close machining tolerances provide smooth and silent operation. Super Swivels do not include studs. All others include studs or barrel bands, depending on type. Developed at the request of the US Military, these 1 1/4 inch swivels were designed to meet their strength and surface treatment standards. The photo appears darker than the actual color, these are actually a silver color