This "Binder in a Box" keeps records neat and dust free. Rugged plastic posts and compression rings lock closed for the ultimate in document security. Posts adjust between 2.75" and 4.25" spacings to suit a variety of materials. Unique snap fastener closure ensures binder opens easily yet locks securely. Box Type: Stackable File Storage; Box Style: Basic Set-Up; Strength: Medium-Duty; File Size Format: Letter.