IMPORTANT: It is important to remember that the plastic binding combs should always be 1/8" larger than the thickness of the book. The easiest and simplest means of determining the proper diameter is to measure the book including covers and add 1/8".
Sizing Table (approximate):
| # Sheets for Binding | Use This Diameter | Quantity (pcs./box) |
| 20 sheets | 1/4" | 100 |
| 40 sheets | 5/16" | 100 |
| 55 sheets | 3/8" | 100 |
| 70 sheets | 7/16" | 100 |
| 90 sheets | 1/2" | 100 |
| 100 sheets | 9/16" | 100 |
| 120 sheets | 5/8" | 100 |
| 150 sheets | 3/4" | 100 |
| 170 sheets | 7/8" | 100 |
| 200 sheets | 1" | 100 |
| 220 sheets | 1- 1/8" | 100 |
| 230 sheets | 1- 1/4" | 100 |
| 290 sheets | 1- 1/2" | 100 |
| 360 sheets | 1- 3/4" | 50 |
| 425 sheets | 2" | 50 |