These U Brands Magnetic Data Card Holders make building and maintaining your planning board a breeze. To use, simply insert desired cardstock label into the side slot of the magnetic label holder. They're perfect to visually communicate updates and quickly arrange data as needed, or simply to use as removable labels for filing cabinets. Versatile data card holders feature a strong magnetic hold that is perfect to use on most any steel surface.These U Brands Magnetic Data Card Holders make building and maintaining your planning board a breeze. To use, simply insert desired cardstock label into the side slot of the magnetic label holder. They're perfect to visually communicate updates and quickly arrange data as needed, or simply to use as removable labels for filing cabinets. Versatile data card holders feature a strong magnetic hold that is perfect to use on most any steel surface.