175 SHEET CAPACITY: The plastic spiral binding coil has a diameter of 9.5mm and can hold up to 75 sheets of paper(A4, 70g), easy to add and reduce paper 24:1 PITCH AND 48 RINGS: The spiral binding coil has a 4:1 pitch and is compatible with any binding machine that punch 4 holes per inch 3100PCS IN TOTAL: A box of 100 spiral binding coils ensure long term productivity for all your binding projects, allowing you to easily bind paper and store for a long time 4360 DEGREE ROTATION: Plastic spiral binding coils allow a 360 degree page rotation function for easier reading, and binding items can be laid flat 5APPLICABLE LETTER SIZE: These 48 ring binding coils are ideal for letter size paper(8.5in x 11in), and the length can also be cut with scissors according to individual requirements. Perfect for engineering documents, business projects, office documents, university presentations 100 x Spiral Binding Coils