Universal Professional Tulip Lens Hood is primarily designed to prevent unwanted stray light (flare) 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 protection from accidental impact. Screw-mount lens hoods, such as this 49mm, are designed to screw right into your lens or filter. Rear locking ring allows the user to rotate the hood in 360°direction.

This Lens Hood will fit the following Sony lenses
Sony E-Mount SEL 1855 18-55mm f/3.5-5.6 Zoom Lens for Alpha NEX Cameras
Sony SEL55210 55-210mm f/4.5-6.3 Lens
Sony SEL24F18Z 24mm f/1.8 E-Mount Carl Zeiss Sonnar Lens
Sony 16mm f/2.8 Wide-Angle Alpha E-Mount Lens
Sony Sonnar T* FE 55mm f/1.8 ZA Lens
Sony 35mm f/1.8 OSS Alpha E-mount Prime Lens
Sony 20mm f/2.8 Wide-Angle Prime Lens
Sony 35mm f/1.8 OSS Alpha E-mount Prime Lens
Sony 50mm f/1.8 DT AF Lens
Sony 50mm f/1.8 DT Alpha A-Mount Standard Prime Lens
Sony 30mm f/2.8 DT AF Macro Lens
Sony 30mm f/3.5 Macro Lens for Alpha NEX