LIGHTWEIGHT ventilation panel TOOL-LESS INSTALLATION: For fast and easy installation, these filler panels feature a tool-less design that snaps onto a standard 19 in. server rack saving you time and hassle. Quality product designed and made in USA Fits standard 19 inch server racks, enclousures, cabinets, and flight packs cases Size 1U= 19" X 1.75" Snap button hardware screws 10-32 included 4ea Abrasion resistant nylon mesh fabric 2 Pack