To convert from millimeters (mm) to inches:
| Factor | Value |
|---|---|
| 1 inch to mm | 25.4 mm |
| 1 mm to inch | 0.03937 inches |
A 21mm drill bit is commonly used in:
| Size (Mm) | Size (Inches) | Use | Page |
|---|---|---|---|
| 19 mm | 0.7480314961 inches | General purpose drilling | View |
| 20 mm | 0.7874015748 inches | General purpose drilling | View |
| 21 mm | 0.8267716535 inches | General purpose drilling | View |
| 22 mm | 0.8661417323 inches | General purpose drilling | View |
| 23 mm | 0.905511811 inches | General purpose drilling | View |
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