Now you can add sling swivels to your Remington 870 shotgun without permanent alteration. Uncle Mike's Magazine Cap Swivel Sets have a factory magazine cap with the swivel base already installed. Just unscrew the factory magazine cap and replace it with the new cap. For the buttstock, a 3/4" wood screw swivel base is included, along with two Super Swivels. Includes: replacement mag cap with swivel base, 0.75" wood screw buttstock swivel base and two 1" Super Swivels Width: 1" Model: QD REM 870 CAP Fits Remington 870 shotguns in 20 Gauge