In addition, since the end of the lens is extended, you also get the added benefit of some extra protection from accidental impact. Dedicated lens hoods are designed to match the specific focal length of the lens it was designed for.
Type - Lens Hood
For use with - Canon EF-S 18-55mm, EF 28-80mm f3.5-5.6/2, U/4, U/5, & 28-90mm Lenses
Weight (g) - 0