High quality construction: both the upper and lower blades are made of hardened stainless steel. The base is a die-cast alloy, robust and impact resistant, durable and quality guaranteed. Punching versatility: the punch features rectangular holes measuring 3 x 8 mm. Hole count is adjustable from 1 to 21. The paper waste drawer-style bin has a large capacity, practical and convenient and reduces the need to handle waste frequently. Manual operation and durability: the hand crank design saves effort and is easy to use, with no power required. The 21-hole full-stroke punch, along with the upper and lower blades, are made of stainless steel. Electric spiral insertion and flexible use: the user-friendly electric spiral inserter allows fast and easy binding of spiral-bound files. Use the manual punch with a full-grip handle, suitable for left-handed, right-handed, or two-handed operation. Use scenarios: - Bind office reports, manuals, and handouts for clean, professional presentations. - Prepare classroom materials, bind projects, and study packets efficiently. - Archive documents by creating compact spiral-bound binders for easy access.