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Steel wool is made by shaving thin layers of steel from wire.

Steel wool consists of long relatively strong shavings with sharp edges.
| Steel Wool | Grade | Fiber Thickness | |
| (inches) | (mm) | ||
| Super Fine | 0000 | 0.001 | 0.025 |
| Extra Fine | 000 | 0.0015 | 0.035 |
| Very Fine | 00 | 0.0018 | 0.04 |
| Fine | 0 | 0.002 | 0.05 |
| Medium | 1 | 0.0025 | 0.06 |
| Medium Coarse | 2 | 0.003 | 0.075 |
| Coarse | 3 | 0.0035 | 0.09 |
| Extra Coarse | 4 | 0.004 | 0.10 |
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