JJC LH-SH115 Bayonet Lens hood is designed for SONY E 55-210mm f/4.5-6.3 OSS E-Mount Lens.
Lens hoods are primarily designed to prevent unwanted stray light from entering the lens by extending and shading the end of the lens.
JJC LH-SH115 Lens hood features a non-glare matte finish on the interior surface to further prevent or limit lens flare. In addition, since the end of the lens is extended, you also get the added benefit of some extra protection from accidental impact.
The hood is also reversible to stay on lens when not in use. Now the original SONY lens cap can be attached to the lens normally.