Feature: 100% brand new and high quality. Fit on 20mm weaver rails Allowing swivel capability to your sling Compatible with Large 1-1/4" push button sling loop Simply push button to detach and attach swivel. Quick- detach feature provides emergency weapon install and release. Material: MetalPackage Content: 1X Heavy Duty Quick Detach Push Button Sling Swivel Set Picatinny Mount 20mm