Uncle Mike's Swivels QD REM 870 EXP Blued 1in Internal Ratchet Cap Set Clam. This Uncle Mike's swivel functions as a replacement magazine cap with swivel base. The Uncle Mike's Remington 870 Swivel Set uses a 3/4" wood screw butt-stock swivel base and two Super Swivels. The Uncle Mike Remington 12 Gauge Swivel is not for 3 1/2" mags. Designed specifically for the Remington Model 870 Express 12 gauge shotgun this swivel makes it easy to carry the 870 Express. Specifications for Uncle Mike's Rem 870 Exp Swivels QD: Manufacturer: Uncle Mike's Color: Black Fabric/Material: Steel Gun Model: Remington Model 870 Condition: New Features of Uncle Mike's Rem 870 Exp Swivels QD: Now you can add sling swivels to your Remington 870 Express without altering your shotgun. 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 Fits Remington 870 Express - not for use with 3.5" magnum shotguns Package Contents: Uncle Mike's Rem 870 Exp Swivels QD Uncle Mike's 18002: Swivels QD REM 870 EXP Blued 1in Internal Ratchet Cap Set Clam