Professional-grade black wire-binding spines designed for letter-size documents. This 100-pack includes 9/16-inch double-loop spines with a 3:1 pitch configuration, accommodating up to 120 sheets per spine. The 32-loop design ensures secure, durable binding for reports, presentations, and bound documents. Black finish complements any professional setting. Ideal for offices, schools, and anyone needing reliable document organization and presentation solutions.