VEVOR Coil Spiral Binding Machine, Manual Book Maker with Electric Binding, 46-Holes Binding 500 Sheets Punch Binder, with 100pcs 5/16'' Coil Binding Spines, for Letter Size, A4, A5Product Features Binding Efficiency and Neatness Our binding machine handles bulk projects effortlessly, punching up to 46 holes, 20 sheets, and binding 500 sheets at once. Ideal for schools, offices, and businesses, it ensures professionally finished documents. Compatible with Various Sizes Featuring 46 detachable pins, this upgraded coil spiral binding machine allows you to insert large and non standard page sizes. It's compatible with Letter size