Blackhawk's Lok-Down sling swivels are precision machined and assembled to exacting tolerances for maximum performance. Made entirely in the USA from premium steel, it utilizes a positive locking mechanism designed to keep the swivel attached to your gun until you remove it. This swivel set is compatible with 10/22, .44 Magnum, Model 44 and No. 3 Ruger Single Shot Carbines. It includes a wood screw rear base, and a 1" swivel set with a blued finish.