Tactical Rifle Sling Swivel: Quick detach rifle sling swivels available in 1 and 1 1/4 inch sizes. To attach tactical rifle sling swivel, unscrew locking screw, press in the locking screw, when the locking lever clears the retaining pin, move the locking lever out of the way, keeping the locking screw pressed in, attach the swivel and return the locking lever over the retaining pin and release the locking screw, and tighten the locking screw to secure the swivel to the rifle swivel base. Please click the technical specs tab for dimensions of the rifle sling swivel.