The Tacticool22 Picatinny Rail Sling Swivel Stud is a one-piece fixed sling stud that mounts on any Picatinny rail and accepts standard QD sling swivels. Constructed of hard anodized aircraft grade aluminum, the adapter allows the mounting of sling swivels to rifles/shotguns equipped with Picatinny or quad rails. This slides onto your Picatinny rail and is clamped in place with a single screw. Not a set screw, this thing is rock solid.