Ultimate Arms Gear Two Steel 1.25" Inch QD Slot Loop Swivels To Allow Attachment of Sling for HK Heckler and Koch G3 MP5 USC MR556 MR762 Set of Two Steel 1.25" (1-1/4-Inch) Designed for Slings 1.25" Wide. Super Heavy-Duty Swivels, Will Hold Up To Years Of Heavy Outdoor Use. Quick and Easy Installation. All Steel Construction, Black Finish.