Ring Binder Donau 4-ring A4 35 mm black

Donau 4-ring A4 binder with a 35 mm spine in black is a practical filing solution for organizing punched A4 documents. The binder features a four-ring metal mechanism and a 35 mm capacity that accommodates moderate stacks of paper, making it suitable for everyday office, school or home filing. Its black cover provides a neutral, professional appearance while protecting stored papers from wear and light damage.

Advantages

The four-ring mechanism ensures stable alignment of punched sheets and reduces page movement. The 35 mm spine offers a balance between compact storage and reasonable capacity for project folders, reports or handouts. The binder’s durable cover resists creasing and maintains a tidy appearance on shelves or in drawers. Its standard A4 format is compatible with common punched paper, dividers and sheet protectors.

Suitable for

• Organizing A4 punched documents for office projects and reports
• School notes, coursework and subject folders
• Home administration files such as manuals, warranties and invoices
• Presentations, handouts or training materials that fit a 35 mm spine

Key specifications

• Format: A4
• Ring mechanism: 4-ring metal
• Spine width: 35 mm (document capacity suited to moderate stacks)
• Cover color: Black
• Compatibility: Standard A4 punched paper and dividers

How to use

Open the binder rings by pulling the ring tabs or pressing the release levers, depending on the mechanism design, and insert punched A4 sheets onto the rings. Close the rings fully to secure pages and check alignment to ensure smooth turning. Use A4 dividers or sheet protectors to separate sections and distribute content evenly inside the 35 mm spine. Store the binder upright on a shelf or flat in a drawer to avoid excessive pressure on the rings and cover.

Usage recommendations

For best results, limit the number of sheets to the binder’s 35 mm capacity and distribute heavier documents across multiple binders if needed. Use standard A4 punched paper and optional dividers to maintain order and prevent overloading the rings. Keep the binder in a dry environment and avoid placing heavy objects on top to preserve ring alignment and cover condition.