1、115 PAGE CAPACITY: The spiral binding coil has a diameter of 14.3mm (9/16in), allowing for up to 115 sheets of paper (A4, 70g) to be easily added or removed. 2、4:1 PITCH 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: The spiral binding coil allows for easy page flipping and reading, as the bound documents can lay flat and be rotated 360 degrees. 5、SUITABLE FOR LETTER SIZE PAPER: These 48 teeths binding coils are perfect for letter size paper (8.5 inches x 11 inches) and can be easily trimmed with scissors according to requirements. Ideal for engineering files, business projects, office documents, and university presentations.