BLACKHAWK! 70SW16BK Rifle Swivel Flush-mount front and rear Bases Stud-free profile when Sling and swivels removed Bases glue in place, no screws Required One inch blued swivel Quality tested in the field, made of quality materials Flush-mount front and rear bases Stud-free profile when sling and swivels removed Bases glue in place, no screws required One inch blued swivel