MIDY304 Stainless Steel Waterproof Pryproof Outdoor Round Cake Quality lock Stainless steel locks are generally composed of three main parts: the lock body, shackle, and locking mechanism. The lock body, often made of solid stainless steel or stainless steel-plated steel, serves as the housing for the internal mechanism. The shackle, which fits into the locking mechanism, may be crafted from stainless steel or hardened steel, depending on the desired level of security. These locks can be operated through different mechanisms, such as keys, combinations, or padlock systems. https://www.welislock.com/product/stainless-steel-lock/