These metallic multi-purpose loose leaf rings are made of tough steel that are nickel plated. Rings open and close easily and have a precision snap catch for secure locking. These rustproof rings are strong and durable. Ideal for use with swatches, keys, documents, bulky loose leaf material, memos, keeping flash cards together, pocket charts, photo album scrap-booking and more . Multi-layered nickel-plating won't crack or split. Locking position for extra security. Easy to operate pull to open and squeeze to close.