1. What does “pitch” mean?

1. What does “pitch” mean?
In simple terms, “pitch” refers to the hole spacing. 4:1 pitch is the standard for spiral binding coils, which means that there are 4 holes for every inch of binding. So an 11” binding edge would have either 43 or 44 holes, depending on the margin size. 5:1 is also available for specialty needs.