Steel sling stud screws with an antique brass finish. Each of the two sets comes with 3 Sling Studs: 2 Screws and 1 Bolt with nut and 3 white spacers. These screw studs will work with both wood and synthetic stocks. These will work with all standard sling swivels. One 1/2″ Wood screw Swivel Stud Base. One 3/4″ Wood screw Swivel Stud Base. One 7/8″ Machine Screw Swivel Stud Base w/Knurled Nut.