Ring Binder Donau 4-ring A4 40 mm blue – Donau 2788404PL-10

Donau 4-ring A4 binder with a 40 mm spine in blue is designed to store punched A4 documents reliably and keep loose sheets organized. The binder accepts standard A4 paper with a four-ring mechanism that allows secure fastening and smooth page turning, providing a practical solution for filing reports, manuals, school materials and home paperwork.

Advantages

The binder features a durable cover and a 40 mm spine capacity that accommodates a substantial stack of punched documents while maintaining a slim profile. Its four-ring mechanism ensures even distribution of pages and stable retention, reducing the risk of pages slipping out. The blue finish offers a professional, easy-to-identify appearance suitable for sorting by subject or project.

Suitable for

• Office filing of reports, invoices and project documentation
• School and university materials, coursework and lecture notes
• Home organization of manuals, receipts and important papers
• Presentations and compiled portfolios that require a standard A4 format

Key specifications

• Format: A4 compatible for punched sheets
• Ring mechanism: standard four-ring binder
• Spine width: 40 mm capacity for punched paper
• Cover color: blue
• Use: manual insertion and removal of punched sheets

How to use

Open the four-ring mechanism to align punched sheets with the rings, insert pages carefully and close the rings until they click to ensure secure fastening. Arrange documents in the desired order before inserting to minimize rework. For thicker documents, check that the total number of sheets does not exceed the binder's 40 mm capacity to avoid stress on the rings or cover.

Usage recommendations

Store the binder upright on a shelf or in a filing cabinet to maintain cover shape and protect the rings. Keep documents punched with standard hole spacing for reliable alignment with the four-ring mechanism. For long-term archiving, periodically check the binder for wear and replace if rings become misaligned.