190 SHEET CAPACITY: The spiral binding coil has a diameter of 12.7mm (1/2in) and can hold up to 90 sheets of paper (A4, 70g), allowing for easy addition or removal of pages. 24:1 PITCH AND 48 TEETH: The spiral binding coil is designed with a 4:1 pitch and 48 teeths, making it compatible with any binding machine that punches 4 holes per inch. 3CONVENIENT PACK SIZE: Each box contains 100 spiral binding coils, ensuring long term productivity for all your binding projects. You can easily bind your papers and have enough supply for a prolonged period. 4360 DEGREE ROTATION: The spiral binding coil allows for a 360 degree page flipping and rotating feature, making it easier to read and allowing your bound projects to lay flat. 5IDEAL FOR LETTER SIZE: These 48 teeth binding coils are perfect for letter sized papers (8.5 inches x 11 inches), and the length can be easily cut with scissors according to individual requirements. They are great for engineering documents, business projects, office documents, and university presentations. 100 xSingle Loop Wire Binding Spines