Magnetic binder rings are ideal for hanging paper onto any metal surface. Each mechanism features 2 strong 16 lb force round magnets that can be attached to ferrous surface including whiteboards, dry erase boards, filing cabinets, machines, refrigerators, and more. Keep employees in the office and in the plant up-to-date on the latest company news, goals, information, 5S processes, and safety procedures. Schools will find these handy in the classroom to display schedules, calendars, and assignments. Use these at home to hang recipe's, chores, photos, charts, homework, achievements, and milestones. HOLDS A4 PAPER – 4 Rings – 1 inch capacity D-shaped rings hold about 225 sheet and has 3.125 inch spacing between the rings while the open and close mechanisms make it easy to add and remove paper.