To convert from millimeters (mm) to inches:
| Factor | Value |
|---|---|
| 1 inch to mm | 25.4 mm |
| 1 mm to inch | 0.03937 inches |
A 309mm drill bit is commonly used in:
| Size (Mm) | Size (Inches) | Use | Page |
|---|---|---|---|
| 307 mm | 12.0866141732 inches | General purpose drilling | View |
| 308 mm | 12.125984252 inches | General purpose drilling | View |
| 309 mm | 12.1653543307 inches | General purpose drilling | View |
| 310 mm | 12.2047244094 inches | General purpose drilling | View |
| 311 mm | 12.2440944882 inches | General purpose drilling | View |
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