The Outdoor Connection Tube Cap is machined from cold rolled steel and quickly replaces the original shotgun magazine tube cap. No alteration or modification of the magazine tube is necessary. The distinctive knurl pattern and black oxide satin finish will blend well with any firearm. Its swivel base rotates 360 degrees which allows for easy installation of any sling. Accepts all standard U.S. detachable swivels allowing easy installation of any sling. 3/4" Wood screws swivel base.