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Hole size categories and their proportionate weights
| Hole category | Hole size description | Hole size (cm) | Hole diameter (cm) | Weight a |
|---|---|---|---|---|
| Size 1 | Smaller than a thumb (finger) | 0.5-2 | 1.25 | 1 |
| Size 2 | Larger than a thumb but smaller than fist (hand) | 2-10 | 6 | 23 |
| Size 3 | Larger than a fist but smaller than a head (head) | 10-25 | 17.5 | 196 |
| Size 4 | Larger than a head | >25 | 30 (assumed) | 578 |
aArea of hole divided by 1.23 [6].
