ET-60 Lens Hood is a device used on the end of a lens to block the sun or other light source in order to prevent glare and lens

ET-60 Lens Hood for CANON Lens, they offer some level of protection for the lens due to the hood extending farther than the lens itself

It's for:EF-S 55-250mm f/4-5.6 IS EF 75-300mm f/4-5.6EF 75-300mm f/4-5.6 II USMEF 75-300mm f/4-5.6 IIEF 75-300mm f/4-5.6 III USMEF 75-300mm f/4-5.6 IIIEF 90-300mm f/4.5-5.6 USMEF 90-300mm f/4.5-5.6 for CANON Lens

ET-60 Lens Hood