Acrylic Sign Holder with Clear Header for 8.5x11 Suggestion Box Graphics. This display case enhances your box by showcasing signage! Constructed from 3mm plexiglass acrylic, it accommodates 8.5x11" graphics. Its overall dimensions measure 13.5x8.5x0.51". At the base, it features two predrilled holes for secure screw attachment. Each hole has a diameter of .24" with a center-to-center distance of 6.42". It includes two M5 wood screws, each 0.5" long, along with two drywall anchors.