CJRSLRB QD Sling Swivel Mount, Aluminum Alloy Heavy Duty Quick Release Detach Push Button Gun Sling Swivel Attachment Mount fit 20mm Weaver Rail Made of high-tensile steel hoop aluminum alloy,with 3/16" thick loop, maximum durability under heavy use guaranteed. Push button mechanism for quick attachment and removal. Black rust resistant anodized finish. Polished ball bearing for smooth 360 degree swivel. Compatible with 20mm standard Picatinny or Weaver rails.