3M™ Touch Privacy Filters provide world-class "black out" privacy from side views outside the 60° degree viewing angle, while creating an excellent viewing experience from straight on views. Designed for full screen monitors with flat glass displays, these privacy filters are reversible between a glossy side and a glare-reducing matte side that helps reduce reflections and hide fingerprints, so you can enjoy pristine image clarity. Diagonal Monitor Size: 21.5"; Fits Device Type: Dell™ OptiPlex 3240 AiO or 5250 AiO; Mounting Details: Adhesive Strips; Filter Material: Polycarbonate.