Ring binder Donau Master lever A4 50 mm red, model 3950001PL-04

Donau Master lever A4 ring binder with a 50 mm spine in red is designed for filing and organising punched A4 paper. The lever-operated mechanism allows controlled opening and reliable closing of the rings, enabling quick insertion or removal of documents while keeping papers aligned. The binder’s high-capacity spine accommodates thick document sets and is finished in a red outer cover suitable for colour-coded filing systems in office, school or home environments.

Advantages

The lever mechanism provides smooth, low-effort operation for frequent use and reduces the risk of misaligned rings. The 50 mm spine offers substantial storage capacity for project folders, reports and manuals without compromising ring stability. The durable cover material resists everyday wear and supports long-term document storage. The red colour helps with visual identification in multi-binder collections.

Suitable for

• Archiving and organising large sets of punched A4 documents
• Office projects, reports and procedure manuals
• School coursework, lesson plans and student records
• Home administration, warranties and personal records

Key specifications

• Format: A4 for standard punched paper
• Spine capacity: 50 mm for high-capacity filing
• Closure type: lever-operated ring mechanism for secure locking
• Colour: red for easy visual sorting
• Material features: durable cover suitable for frequent handling

How to use

Open the rings by operating the lever to expose the ring openings, align your punched A4 sheets on the rings and then close the mechanism until the rings engage securely. Arrange documents on rings in the order you need and ensure pages are properly punched to prevent tearing. Store the binder upright on a shelf or lay flat for transport, keeping the cover closed to protect contents from dust.

Usage recommendations

For optimal longevity, avoid overfilling beyond the 50 mm spine capacity and distribute heavy inserts evenly. Use reinforced punched pockets or dividers for frequently referenced documents to minimise wear on hole punches and paper edges.