Uncle Mike's Super-Premium Lifetime Sling Swivels (Blued, 1-1/4-Inch Loop) Swivel Lock spring-loaded plunger and a knurled, threaded sleeve eliminates accidental opening of the swivel Super-premium, top-of-the-line model Exceptional strength  tested to over 400 lbs. One-piece MIM (Metal Injection Molding) construction for unrivaled integrity Closed Link technology creates a permanent ring bond