A4 Paper Binding Coils Respicefinem 100 Pieces Spiral Binding Coils Iron 14.3mm Office Document Binding Coils High Capacity Binding: High capacity spiral binding coils with a diameter of 14., 3mm can securely bind up to 115 sheets of A4 paper (70g), great for extensive reports or presentations requiring binding HIGH CAPACITY BINDING: These spiral binding coils can hold up to 115 sheets of A4 paper (70g), making them for thick documents like business reports, engineering plans, and university presentations. The 14.3mm diameter ensures durability and long-term use. 360 DEGREE ROTATION Professional Compatibility: With a 4:1 pitch and 48 teeth, these spiral binding coils are compatible with any standard 4 holes per inch punching machine, making them an essential tool for professional document finishing in offices or educational settings Aazon.co : Spiral Binding Coils, 3 Spec:Item Type: Spiral Binding CoilsBinding Diameter: 14., 3mm(9/16in)Binding Capacity: 115 Sheets(A4, 70g)Teeth Quantity: 48 TeethRatio: 4:1Package List:100 x Spiral Binding Coils Buy Red 6mm Spiral Bindings 4:1 Plastic Spiral Coils Online Versatile Usage: Suitable for letter size (8., 5in x 11in) documents, these spiral coils offer the flexibility to be cut to size, ideal for various projects including engineering documents, business proposals, and academic papers