CFS Products 8-Mm (5/16") Binding Coils - Coil08 - Pre-Sized To Fit Letter Sized Paper - 4:1 Pitch (4 Holes Per Inch) - 12" Long - Compatible With

Mead Combbind Binding Spines/Spirals/Coils/Combs, 1/2", 85 Sheet Capacity, Black, 125 Pack (4000134)

Maitys 300 Pcs Plastic Binding Combs Bulk Comb Binding Ring 19 Ring Comb Binding Spines Letter Size Spiral Binding For Notebook Calendar Picture

GBC Binding Spines / Spirals / Coils, 5/16" Diameter, 45 Sheet Capacity, Proclick, Black, 100 Pack (2514700)

CFS Products Plastic Comb Binding Spines, 1 Inch Diameter, Black, 200 Sheets, 100 Pack 13100

CFS Products Plastic Comb Binding Spines, 1/2 Inch Diameter, Black, 90 Sheets, 100 Pack

Binditek 100 Pack Plastic Spiral Binding Coils, 8Mm(5/16"), 40 Sheet Capacity, 4:1 Pitch, Black Binding Spirals, For Students And Coworkers

Fellowes 5/16-Inch Binding Spines Wire, 25-Pack, Black (5255201)