BQLZR Multifunctional 304 Stainless Steel Spring Loaded Gate Snap Carabiner Quick Link Lock Ring Hook M4 40mm Pack of 5 Made of 304 stainless steel, it won't rust, durable. For backpack, key ring, chains, ropes, camping, hiking, fishing, pet, indoor outdoor equipment gear, DIY accessories Can use it for backpack, key ring, chains, ropes, camping, hiking, fishing, pet, indoor outdoor equipment gear, DIY accessories.