For a proper method of drilling, the drill mold is important. A drill mold gives a drilling instruction to the supplier.
How do you read a drill mold?
For example L4-7-6-80 means:
| Code | Remark |
| L | Position left of the book |
| 4 | Number of holes |
| 7 | Diameter of the drilling in mm |
| 6 | Distance between the leaf edge and beginning of the drilling |
| 80 | Distance between the drilling centers |
