Enhance your document binding projects with our high-quality Spiral Binding Coils, designed for durability and ease of use. With an 8mm (5/16 inch) diameter, these coils can securely bind up to 40 sheets of A4 paper (70g), providing the perfect balance of capacity and flexibility. Crafted from premium plastic material, these binding spines offer excellent toughness, wear resistance, and aging resistance, ensuring long-lasting performance for all your binding needs. Key Features: · Optimal Diameter and Capacity: 8mm coil diameter accommodates up to 40 sheets of A4 (70g) paper, allowing easy addition or removal of pages without compromising binding integrity. · Precise Binding Specifications: Featuring a 4:1 pitch with 48 loops, these spiral binding coils are compatible with any binding machine that punches 4 holes per inch, ensuring a secure and professional finish. · Durable Plastic Construction: Made from high-quality plastic that provides strong toughness, resistance to wear and aging, prolonging the lifespan of your binding coils. · 360 Degree Page Rotation: Designed to allow full 360-degree turning of pages, enabling your documents to lay flat for easy reading and presenting a neat, professional appearance. · Versatile Applications: Ideal for binding letter-size paper (8.5x11 inch), documents, manuscripts, reports, and other paperwork, making these coils suitable for office, school, and home use. Specifications: · Item Type: Spiral Binding Coils · Binding Diameter: 8mm (5/16 inch) · Binding Capacity: Up to 40 Sheets (A4, 70g) · Number of Loops: 48 Loops · Pitch: 4:1 Package Includes: · 100 x Spiral Binding Coils Experience the convenience of reliable and sturdy spiral binding with these easy-to-use plastic binding coils, perfect for organizing your documents efficiently and professionally.