BlackHawk Hard Push Button Sling Swivel Black. Specifications for BlackHawk Heavy Duty Push Button Sling Swivels: Manufacturer: BlackHawk Color: Black Finish: Manganese Phosphate Features of Blackhawk Heavy Duty Push-Button Sling Swivel 71SS00BK: Allows operator to quickly attach/detach sling from the weapon Made of quality materials with a durable protective Manganese Phosphate finish Compatible with most push button swivel mounting points Package Contents: Blackhawk Heavy Duty Push Button Sling Swivels BlackHawk 71SS00BK: Hard Push Button Sling Swivel Black