Made of 316 stainless steel, good corrosion resistance. Heavy duty, long service life The elegant round shape and polished surface add a sleek, sophisticated look Simply turn the button to lock and unlock, offering both convenience and safety Suitable for securing boat doors, hatches, and other marine equipment, providing a reliable locking mechanism that keeps doors tightly shut, there are also many exteriors cabinetry applications as well, twist lock round door Deep hole design, not easy to fall off during use, the screws we provide are flush with the holes