This three-piece pack from Nite Ize contains three of their S-Biner SlideLock carabiners in three different sizes. Each one is made from high-quality stainless steel for maximum load-bearing strength, with the size #4 carabiner being capable of supporting up to 75 pounds. Their stainless steel wire gates feature polymer sliders that provide a secure slide-to-lock mechanism, ensuring that the carabiner remains closed until you unlock them, allowing you to rely on them to carry important equipment. The gates can be locked and unlocked independently, making it convenient to attach and remove equipment.