The Vevor binding machine is designed to deliver efficient, professional-looking document binding for offices, schools, and businesses. It punches up to 21 holes, handles up to 12 sheets per punch, and supports binding projects up to 450 sheets. Adjustable edge guides and side margins help accommodate Letter, A4, and A5 paper sizes with ease. Its durable construction combines an iron base, ABS shell, metal side arms, and carbon steel blades for long-lasting use. The package also includes 100 3/8" comb binding spines for added value.