Lens hoods are primarily designed to prevent unwanted stray light from entering the lens by extending and shading the end of the lens. In addition, since the end of the lens is extended, you also get the added benefit of some extra protection from accidental impact.
Dedicated lens hoods are designed to match the specific focal length of the lens it was designed for. The Zeiss Lens Shade 25mm and 28mm is designed for ZM rangefinders.
More information about Zeiss Products: (Link to Zeiss Website)