RAYSON wire coil binding spine is made of quality metal, enhances your document life, and coil bound documents can open flat and wrap around for easy copying and reading
Binding Capacity: up to 60 sheets, Length: 36 Loops, for A4 sheets
3:1 pitch binding ring means per inch has 3 holes (This is very important distinguish 3:1 from 4:1 cause the things to be as different. 4:1 means per inch has 4 holes; They are used with different binding machine)
This wire spiral binding coil is great for binding reports and presentations, use with any 3:1 pitch coil or wire binding machine