The SlideLock Carabiner provides convenient attachment with a locking gate. It's the classic carabiner with a Nite Ize innovation! At Nite Ize, they believe no product is too small or basic to be improved. Exhibit A: the classic utility carabiner. They took a hard look at this ubiquitous device and saw two good opportunities to make it more efficient. Nite Ize designed an innovative slide-to-lock feature that securely locks the gate with a simple push and slide movement, and unlocks when you want it to just as easily. Then, instead of a bulky tubular construction, they designed a cross sectioned, rectangular stainless steel body that's durable, low profile, and slim; it feeds more easily through smaller openings and rests flat in pockets. Available in two sizes: #4 is perfect for attaching to a belt loop or backpack to carry larger items and #2 is great for carrying smaller items like keys, and attaching to zipper pulls. Size #2 Dimensions: 1.7" x 1.1" x 0.1" | Weight Rating: 10lbSize #4 Dimensions: 3.1" x 2.0" x 0.1" | Weight Rating: 75lb | Nite Ize SideLock Carabiner in Grey | Size 4