Features 1. 115 PAGE CAPACITY: The spiral binding coil has a diameter of 14.3 mm (9/16 in. ), allowing you to easily add or remove up to 115 sheets of paper (A4, 70g). 2. STEP 4:1 AND 48 TEETH: The spiral binding coil features a 4:1 pitch, making it compatible with any binding machine that punches 4 holes per inch. 3. 100PCS: Each box contains 100 spiral binding coils, ensuring long-term productivity for all your binding projects and convenient storage. 4. 360 DEGREE ROTATION: Spiral binding spool allows pages to be turned and read easily, as bound documents can lie flat and rotate 360 degrees. 5. SUITABLE FOR LETTER SIZE PAPER: These 48 teeth binding bobbins are perfect for letter size paper (8.5" x 11") and can be easily trimmed with scissors as required. Ideal for engineering files, business projects, office documents and college presentations. Specification: Item Type: Single Loop Wire Binding Spines Material: iron. Binding Diameter: 14.3mm (9/16") Binding capacity: 115 sheets (A4, 70g) Number of teeth: 48 teeth Step: 4:1 How to use: Install and play! Packing List: 100 x Single Loop Wire Binding Spines Package List 100 x Single Loop Wire Binding Spines