Ring Binder Donau 4-ring A4 30 mm black – Donau 2788304PL-01

Donau 4-ring A4 binder with a 30 mm spine in black is a functional document organiser designed to store punched A4 sheets. The binder combines a durable outer cover with a standard four-ring mechanism that accepts punched paper, enabling orderly storage of reports, handouts and reference materials. Its slim 30 mm width accommodates moderate-sized document sets while keeping a low profile on shelves and in folders.

Advantages

The binder offers reliable sheet retention thanks to its four-ring mechanism and a secure spine that maintains alignment of documents. Its A4 format and standard ring spacing make it compatible with commonly used punched paper, while the black finish provides a neutral, professional appearance suitable for office, school and home environments. The 30 mm spine balances capacity and compactness for everyday filing needs.

Suitable for

• Organising and storing A4 punched documents, reports and handouts
• Office filing and project documentation
• School notes, assignments and course materials
• Home administration, manuals and reference sheets

Key specifications

• Format: A4 compatible
• Ring system: four-ring mechanism for standard punched sheets
• Spine width: 30 mm capacity
• Colour: black
• Suitable for punched paper with standard hole spacing

How to use

Open the rings using the ring-release mechanism, align punched sheets with the ring openings and insert them carefully to avoid tearing. Close the rings until they click to ensure secure fastening. Use the spine to label the binder externally for quick identification. For thicker sets, distribute pages evenly and consider using dividers or plastic sleeves to protect frequently referenced documents.

Usage recommendations

Store the binder upright on shelves to preserve the ring alignment and avoid overfilling beyond the 30 mm capacity to prevent stress on the rings. For long-term archiving, combine with archival sleeves or acid-free paper to protect documents.