Officemate Verticalmate Heavy Duty Magnets, Large, Set of 2 (29501) Four use with Verticalmate products Attach to keyholes to securely attach Verticalmate organizers to any metal surface Use with metal file cabinets, shelving, or any metal surface. The package (card with 2 magnets) is 4.3125 W x 3.875 H x 0.25 D