Yankee Hill Machine Keymod Q.d. Sling Adapter Qd Swivel Not Included. The sling swivel stud allows you to attach a sling with a swivel nut to the sling thus preventing it from slipping off. The sling swivel's retaining screw allows you to remove it and reinstall easily. This prevents your sling from becoming unseated from the swivel during use. It also acts as a locking swivel when the sling is attached and secured using the included quick detach (QD) sling swivel. Since the adapter base is in the same plane as the QD swivel it prevents it from slipping and binding. Specifications for Yankee Hill Machine Keymod Q.d. Sling Adapter Qd Swivel Not Included: Type/color: Qd sling swivel adapter Size/finish: Keymod Material: Aluminum Ar-15 accessory: Y Package Contents: Yankee Hill Machine Keymod Q.d. Sling Adapter Qd Swivel Not Included The Yankee Hill Machine Keymod Q.d. Sling Adapter Qd Swivel Not Included is a quality addition to the Yankee Hill Machine lineup. For more great deals on Swivels by Yankee Hill Machine please browse our Yankee Hill Machine Weapon Accessories page. Yankee Hill Machine Keymod Q.d. Sling Adapter Qd Swivel Not Included