Nikon HB-40 Bayonet Lens Hood.
The dedicated Nikon HB-40 Lens Hood is specifically designed for use with the AF-S Zoom Nikkor 24-70mm f/2.8G ED lens. 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.
Compatible With:
AF-S NIKKOR 24-70mm F2.8G ED