Uncle Mike's QD Quick Detachable Super Swivel 1391-2 for 1" slings The Uncle Mike's quick detachable sling swive set features a unique quick detachable (QD) design that stops the metal swivel body from contacting the gun The close Machining tolerances provide smooth and silent operation The partial Magnum band fore-end base clasps your magazine tube or barrel for easy installation without dismantling the firearm The partial Magnum Band fore-end base clasps your magazine tube or barrel for easy installation without dismantling the firearm Mounts on magazine tubes .630-.675" diameter Mounts on barrels of some Ruger and Browning models; also fits .410 shotguns Closed Link technology creates a permanent ring bond