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plastic clip,paper clip,office accessory
spiral binding, binding products, metal spiral,
the specification as follows:
| Coil Diameter | Filament Size | Recommended Max Books Thickness | Pitch | |
| Inch | mm | mm | mm | mm/inch |
| 1/4 | 6.40 | 0.90 | 3.40 | 6,8,10,12 / 1:4,1:3,1:2 |
| 5/16 | 7.90 | 4.90 | ||
| 3/8 | 9.50 | 6.50 | ||
| 7/16 | 11.10 | 1.20 | 8.10 | |
| 1/2 | 12.70 | 9.70 | ||
| 9/16 | 14.30 | 11.30 | ||
| 5/8 | 15.90 | 12.90 | ||
| 3/4 | 19.10 | 15.10 | ||
| 7/8 | 22.20 | 18.20 | ||
| 1 | 25.40 | 20.40 | ||
| 1-1/8 | 28.60 | 1.50 | 23.60 | |
| 1-1/4 | 31.75 | 25.80 | ||
| 1-1/2 | 38.10 | 32.10 | ||
plastic clip for A4 size
