Features 1、The unique quick detachable design stops the steel swivel body from contacting the gun 2、The close machining tolerances provide smooth and silent operation 3、One threaded swivel post for the butt stock and one front post with nut 4、Super heavy-duty swivels, will hold up to years of heavy outdoor use. Quick and easy installation 5、Spacer included to insure a secure tight fit and not scratch the shotgun Description: The unique quick detachable design stops the steel swivel body from contacting the gun. The close machining tolerances provide smooth and silent operation. For end adapter with stud installed in the barrel band of gun. Swivel lock spring-loaded plunger and a knurled, threaded sleeve eliminates accidental opening of the swivel. Features: 1. The unique quick detachable design stops the steel swivel body from contacting the gun. 2. The close machining tolerances provide smooth and silent operation. 3. One threaded swivel post for the butt stock and one front post with nut. 4. Super heavy-duty swivels, will hold up to years of heavy outdoor use. Quick and easy installation. 5. Spacer included to insure a secure tight fit and not scratch the shotgun. Specifications: Material: Steel Color: Black Package Weight: approx. 100g Size(ring diameter width): approx. 0.7cm / 0.28" Product Size: approx. 3.4 x 3.1cm / 1.33" x 1.22" Fits: For Mossberg 500 12 Gauge Package Included: 1 x magazine cap sling adapter 1 x butt stock sling stud 2 x 1" steel swivels 1 x retainer and removal tool 1 x 3/4" buttstock screw and washer Package List