Not suitable for mountaineering. 304 Stainless Steel: These quick links are made of SUS 312 stainless steel, which has higher hardness and corrosion resistance than other common alloy steels. High-quality hardware can withstand harsh weather conditions for a long time and is extremely durable and safe. Easy to Use: Turn the thread clockwise to open and counter-clockwise to close. And the extremely smooth threads are very convenient for installation and disassembly, even when they have been closed for a long time. Max. Load 294 kg: Unique design and reinforced stainless steel material for improved load-bearing capacity. The maximum load capacity of this link is 294 kg. Almost all needs are met. Tip: For safety, do not exceed the maximum load. Multifunctional: M5 stainless steel chain link, perfect for outdoor activities such as swing sets, sun sails, keychains, backpacks, and so on. (Not suitable for mountaineering) SATISFACTION SERVICE - One package contains 16 quick links to meet your quantity and long-term use needs.