Nite Ize has brought innovation to the traditional carabiner. These lightweight carabiners ditch the traditional bulky tubular construction for a cross sectioned, rectangular body that's low profile and slim to feed more easily through small openings and rests flat in pockets. It also features an innovative slide to lock design that securely locks the gate with a simple push and slide movement, and unlocks when you want just as easily. This set comes with 3 sizes: #4 (perfect for attaching to a belt loop or backpack to carry larger items), #3, and #2 (for carrying smaller items like keys, and attaching to zipper pulls).