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Parshields^® Glare Visors prevent glare and improve visibility. These IDA-approved dark-sky friendly fixtures redirect light that would be wasted toward useful directions and reduce light trespass so your lights don't annoy your neighbors. They also reduce sky glow by preventing up-light. Contents: Two shields (5 1/2"x5 1/2"x5 1/2", reusable, powder coated, all metal construction), instructions and light pollution information. Bulbs and fixtures are not included. For use with PAR 38 Type outdoor floodlights with 4 3/4" rim.