1. [High Capacity] The plastic spiral binding spool has a diameter of 38 mm and can hold up to 310 sheets of paper (A4, 70 g), making it easy to add and remove pages.
2. [4:1 Pitch Compatibility] The spiral binding spool has a 4:1 pitch, making it compatible with any binding machine that drills 4 holes per inch.
3. [360 Degree Rotation] With the ability to rotate 360 degrees, this binding spool makes it easy to flip and read pages, making it easier to work on bound projects.
4. [18 Pieces Set] Each package includes 18 spiral binding spools, ensuring long-term productivity for your binding projects, allowing you to effortlessly bind papers and store them safely.
5. [Versatile Application] Ideal for letter size paper (8.5 x 11 inches), the length of the spiral coil can be easily cut with scissors. for engineering papers, business projects, office papers and academic presentations.

Specifications:
Item Type: Spiral Binding Spool
Material: PVC plastic
Binding diameter: approx. . 38 mm/1 1/2 inches.
Binding capacity: 310 sheets (A4, 70 g)
Number of Loops: 48
Pitch: 4:1

How to use:
Remove the product and install it to use.

Package List:
18 x spiral binding spool