These latches have not been cleaned and are in “as found” condition with a dark patina. The catches (with a hint of copper tiger striping) were not found with them but they look great together.
A transom is a single pane hinged window frequently found over old doors to allow air circulation. The ring is to allow a pull down hook to release them but an option would be to attach some sort of rope or chain. If used within easy reach, a finger fits nicely in the round hole!
If you need a Pull Down Hook you can find one at WO1019
Latch: 1-5/8” x 2”
Catch: 3/8” x 2”