GSI Super Quality Lens Hood for CANON EF 100mm f/2.8 Macro USM, and EF 100mm f/2.8 Macro Lenses - Functions Exactly as the Canon ET-67, Provides Protection from Light and Impact

Replacement for Canon ET-67 Lens HoodCompatible with the Canon EF 100mm f/2.8 Macro USM LensPrevent unwanted stray light from entering the lensExtra protection from accidental impactDesigned to match the specific focal length of the lens
Product DescriptionThis GSI Lens Hood is 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

Source: Digital Camera and Video Store...