Ultimate Arms Gear Two QD 1" Inch Slot Loop Detachable Screw and Nut Studs Swivels with Spacers for AR15, AR-15, M4, M-4, M16, M-16 .223 5.56 556 .308 Set of 2 Steel Swivels 1" Wide + Wood Screw Studs 3/4-Inch Screws & 7/8-Inch Machine Screw and Nut for the Forend. Designed for Straps or Claws 1" Wide or Less. All Steel Construction, Black Finish. Super Heavy-Duty Swivels, Will Hold Up To Years Of Heavy Outdoor Use. Quick and Easy Installation. Fits Wood and Most Synthetic Stocks & Forends. Machine Screw Fore End base and nut allows for installation on thicker stocks as well as allows mounting in the fore end of most synthetic stocks where not enough material is present for wood screws to make a solid hold (excess of machine screw may have to be removed before it can be placed in the stock)