WOLTIS QD Quick Detach Sling Swivel Sling Adapter with Weaver Rail Mount Fit on 20mm Weaver/ Picatinny Rails. Come with Large 1-1/4" Push Button Sling Loop High Quality CNC Machined Aluminum Alloy Construction Allows to Mount the Swivel Anywhere along the Rail System Designed to Mount the Popular Push Button QD Sling Swivel