#3, Stainless Steel, Slide Lock, Classic Utility Carabiner, Slide To Lock Feature That Securely Locks The Carabiner's Gate With A Simple Push & Slide Movement, & Unlocks When You Want It To Just As Easily, Cross Sectioned, Rectangular Stainless Steel Body That's Durable, Low Profile, & Slim, Feeds More Easily Through Smaller Openings & Rests Flat In Pockets.