To convert from millimeters (mm) to inches:
| Factor | Value |
|---|---|
| 1 inch to mm | 25.4 mm |
| 1 mm to inch | 0.03937 inches |
A 221mm drill bit is commonly used in:
| Size (Mm) | Size (Inches) | Use | Page |
|---|---|---|---|
| 219 mm | 8.6220472441 inches | General purpose drilling | View |
| 220 mm | 8.6614173228 inches | General purpose drilling | View |
| 221 mm | 8.7007874016 inches | General purpose drilling | View |
| 222 mm | 8.7401574803 inches | General purpose drilling | View |
| 223 mm | 8.7795275591 inches | General purpose drilling | View |
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