Canon 4414B001 (441/4B001, 441-4B001, 4414B/001, 4414B 001) ET-120 Lens Hood (WII).
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 past the end of the lens, you also get the added benefit of extra protection from accidental impact to the lens. A dedicated lens hood is designed to match the specific focal length of the lens it was designed for. This ET-120W II Lens Hood for EF 300mm f/2.8L IS II is a dedicated lens hood designed only for use with the Canon EF 300mm f/2.8L IS II lens.
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