Mennon A-S 49 Screw Mount 49mm Hood for Standard 50mm Lens, Black ABS series "A-S 49" lens hood with screw mount can be attached to the 49mm lens or filter thread made of extremely shock and wear resistant, high-strength engineering ABS plastics high quality smooth outside and mate inside finish suitable for standard lens (50mm focal distance) of most 35mm SLR cameras Screw hood to the thread of the lens or filter .