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