Our heavy-duty, cast iron sash lock is a House of Antique Hardware exclusive! This distinctive design, with its tall half-cup keeper, is the type found in early 20th century schools, offices and commercial buildings, as well as fine homes. Made of durable cast iron with a weathered and lacquered antique finish, it locks your windows tightly. Over time humidity and use may cause the lacquer to wear, allowing natural and desirable aging to occur.