Ring binder Donau Master A4 50 mm blue

Donau Master A4 50 mm blue is a ring binder designed to store and organise A4 documents with a 50 mm spine capacity. The binder features a metal ring mechanism that securely fastens punched sheets and allows smooth opening and closing for easy access. Its rigid cover provides protection for papers, reports and invoices, while the practical spine width accommodates a substantial volume of documents for office, school or home use.

Advantages

The binder offers a sturdy build and a reliable metal ring mechanism that reduces the risk of sheet loss and ensures even alignment of pages. Its 50 mm spine is suitable for moderate to large collections of documents without significant bulging. The blue cover gives a clear visual identification for filing systems and the rigid construction protects contents from bending and damage during storage and transport.

Suitable for

• Organising reports, meeting notes and invoices
• Storing project documentation and handbooks
• Archiving school assignments and course materials
• Keeping manuals and reference sheets in offices or workshops

Key specifications

• Format: A4 compatible
• Spine capacity: 50 mm
• Closure: metal ring mechanism (ring binder)
• Cover type: rigid protective cover
• Colour: blue
• Intended use: document storage and organisation

How to use

Open the metal rings using the ring release on the mechanism, insert punched sheets or punched plastic sleeves, then close the rings firmly to secure the contents. Arrange documents in the desired order before inserting to minimise re-opening. Use dividers or labelled separators to divide sections and improve retrieval. When transporting, keep the binder upright or flat to reduce stress on the rings and pages.

Usage recommendations

For extended archiving, use acid-free punched sleeves or archival paper to protect important documents. Avoid overfilling beyond the 50 mm spine capacity to preserve ring alignment and cover shape.