This is the filing format for a cabinet rather than a shelf: the clip holds punched sheets securely and the file lies flat, so a drawer takes far more of them than it would ring binders. Pages are added in order rather than inserted mid-file easily. Check the punch spacing matches. See filing fasteners, manilla folders and top load files.

Blue spring transfer files on a bright office desk with documents, keyboard, notebook and organised stationery.
Spring Files for Documents

Shop spring files for reports, forms, manuals, notes, office records and easy document access.