The 3M™ Privacy Filter PFMT27 custom cut for the Apple® 27" Thunderbolt® monitor. Using 3M™ microlouver technology the filter gives full 60o privacy protection on either side, protection sensitive information from unauthorised viewing. The filter applicat - 3M™ microlouver privacy technology provides privacy screen protection for sensitive data. - Reversible glossy or matte screen finish. Matte screen finish reduces discomfort from screen glare.