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[WIDELY USED]: Suitable for binding various sizes of paper including A4, B5, A5, A7, and A6 [10 SHEETS CAPACITY]: Can penetrate up to 10 sheets (70g)

Handheld Portable Spiral Binder A4 A5 A6 A7 Coil Book Round Hole Puncher with Scale Line and All Metal Body for Binding A4, B5, A5, A7, A6 Paper

Metal Spiral Rings Binder Clip Diary Notebook Planner A4 A5 - Temu

Metal Loose Leaf Rings Binder Book Rings Loose Leaf Binder - A4/a5/a6/a7/ b5 Metal - Aliexpress

A7 A6 A5 Scissor Clip Notebook Loose Leaf Ring Transparent Binding Rings Budget Binder Plastic Book Rings Ring Binder - AliExpress

Metal Spiral Binder Clip Ring Stainless Steel Binding Ring - A4 B5 A5 A6 Colorful - Aliexpress

A7 A6 A5 Scissor Clip Notebook Loose Leaf Ring Transparent Binding Rings Budget Binder Plastic Book Rings Ring Binder - AliExpress

A6 Binder - Office & School Supplies - Aliexpress - The best a6 binder

A5 A6 PU Leather Notebook Binder Can be filled with 6-ring Binder, Paper-filled Personal Binder Cover with Magnetic Closure

Loose Leaf Book Bindera6/a5/a7 Spiral Binder Notebooks - 10pcs Clear Pvc Cover, Soft Copybook