The 34 hole click binding ring fits A4 sized paper (8.3 x 11.7inches), which is not a standard US letter paper size (8.5 x 11inches). Binding letter
Binding capacity: 25 to 80 sheets of paper. Pitch: 2:1 (21 loops), length: 11 inches, for letter size sheet format. Golden, Pack of 100 Perfectly
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Rayson Proc1230M Click Binding Spines, Easy Edit Spines, 1/2 Diameter, 90 Sheet Capacity, Multicolor, 30/Box - Imported Products from USA - iBhejo
Rayson WR-32-105-100-B Double Loop Binding Wires 1/2 Inches 3:1 Wire Binding 32-Loop Wire Ring Pack of 100 Black
Rayson MTSBRM4116 Metal Coil Spiral for Binding, 4:1
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GBC Binding Spines/Spirals/Coils, 3/4 Diameter, 150