These plastic spiral binding coils are suitable for various office occasions and provide great convenience for file storage, file binding, paper collection, etc.It is a portable product for office and study.

Specification
Inner diameter: 8mm/0.32 inch;  
Length: 31cm/12.2 inch;
Coil spacing: 4:1;
Number of binding pages: 40;
Material: plastic;
Color: Black;
Packing List: 20 Pcs Plastic Spiral Binding Coils

Advantage
The spiral binding coils are made of long-lasting, strong plastic to ensure long-term productivity for all your binding projects, allowing you to easily bind papers and preserve them for a long time.

Instruction
Spiral binding coils have a 4:1 pitch, making them suitable for any binding machine that punches 4 holes per inch.Binding spirals provide a 360-degree page-turning rotation capability for easier reading.

Note
These 4:1 pitch binding coils are not suitable for machines.