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F4 Size P3: 1 Wire Binding Machine Book Binder Calendary Punch (T970). Heavy Duty Aluminum Build: Constructed from strong and tough aluminum material for durability. High Capacity Punching: Capable of punching up to 25 sheets of 70-80g F4 size paper at once. Versatile Paper Support: Features paper extension structure to handle A3, B4, and other large sizes. Precise 40-Hole Binding: P3:1 configuration with 40 holes specifically designed for F4 size documents. Customizable Hole Options: Offers selectable pins for 4*4mm square holes or 4.5mm round holes. OEM Service Available: Manufacturer provides OEM services for customized branding and needs.