Acco Metal Book Rings, 1-1/2in Diameter, 100 Rings Per Box (ACC72204)
Strong nickel-plated steel rings won't crack, split or bend. Rustproof rings are user friendly: pull to open, squeeze to close. Locking round rings lock securely to prevent your swatches, keys, sheets, memos, and invoices from falling out. Great for portable or car use.