Product Description Spacer Blanks are a cut above the rest. Spacer Blanks or Filler Panels are often thought of as a way to fill in any gaps in a rack. Filler Panels make racks looks neat, clean, and organized. When installed properly, the rack not only looks good but the added strength you get from using Spacer Blanks protect your equipment. These Spacer Blanks have two 1/4 inch flanges to make them more rigid and shore up a server rack or cabinet. Flanged Spacer Blanks/Filler Panels provide the most added strength, and are often used to help manage air flow. They can easily be installed with any rack hardware or use the Tool-less snap in clip provided. The Tool-less feature makes installation a breeze with any cage nut Style Rail.