The used Nikon HB-99 Lens Hood is a black plastic hood that is designed to prevent unwanted stray light from entering the lens by extending and shading the front optic of the lens.
It is dedicated to the NIKKOR Z MC 105mm f/2.8 VR S Macro lens and attaches via a bayonet mount. It also offers protection from accidental impacts to the lens’s front element. A dedicated lens hood is designed to match the angle of view of the lens for which it was designed.