Rayson PROC1230M Click Binding Spines, Easy Edit Spines, 1/2 Diameter, 90 Sheet Capacity, Multicolor, 30/Box

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

Rayson TD1222 Wire Binding Machine - 2:1 Pitch, Rectangle Holes, 220 Sheet Binding / 12 Sheet Punching Capacity : Office Products

Rayson WR32159M Wire Binding Spines, Multicolor, 3:1 Pitch Double Loop Binding Wires 5/8 Inch, 32-Loop Wire Ring Pack of 50 with Black, Gold, Blue, White, Silver : Office Products

MyBinding 2 to 1 Pitch Twin Loop Wire Binding Spine

KW-Trio Binding Spines,KW-trio 10pcs Plastic 30-Hole

GBC ProClick Binding Spines, 1/2, Black, 25 Pack

Binding Capacity: up to about 105 sheets ( 80g/20lb) Length: About 12 (36 Loops). It can be used with US letter size paper (8.5x11) Or used with

Rayson 15.9mm Coil bindings Spines, 5/8 Multicolored Spiral Binding Coil 3:1 Pitch - 36 Loops, 100/Box, SR31159-100MRPBYC

10Pcs Spiral Binding Coil 30 Holes 16mm Diameter Loose

GBC 4000104 CombBind Standard Spines, 3/4 Diameter

KW-Trio Binding Spines,KW-trio 10pcs Plastic 30-Hole

GBC Pro-Click Binding

GBC Binding System, Manual, Desktop Binding Punch, 6