Sparco - Plastic Binding Spines - 1-1/2" - 320 Sheet Capacity - 100/BX BK 18003 The Sparco Plastic Binding Spines are designed for office use, specifically for binding large amounts of paper or documents. With a 1-1/2" diameter, these spines have a 320 sheet capacity and come in a pack of 100 per box. Manufactured by Sparco, a trusted brand in office supplies, these binding spines provide a secure and durable way to organize and store important documents and paperwork. Ideal for businesses and individuals looking to keep their important documents well-organized and neatly stored.