Allows a push button base mounting point on the buttstock of a stock AR that has slots for a sling But no place to mount a push button swivel. Features a custom designed one piece aluminum keeper base and a stamped steel Keeper that acts as a catch-lock. Both are sewn into a 1" Nylon web for an ultra easy installation. Package INCLUDES: - rubber o-ring for reduced noise - extra catch lock mechanism Specifications: - Length: 3" - Finish: Black oxide.Specifications and Features: Length: 3 inches Finish: black oxide Features a custom designed one piece aluminum keeper base and a stamped steel keeper