The key chain with lobster clasp, extension chain, and open jump ring is durable, light, and durable. The surface alloy and electroplating are not easy to rust. This can be used in various applications, sports equipment, pet products, suitable for organizing door keys, car keys, elevators, making handicrafts projects, etc. The open-loop and extension chain is ideal for connecting clasps, amulets, links, and other accessories for easy carrying.