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How many drills you need
Square drills are 2.5 mm, so a 40 × 50 cm canvas is 160 × 200 = 32,000 drills. Round drills are about 2.8 mm, roughly 25,600 for the same canvas.
| Canvas | Square (2.5 mm) | Round (≈2.8 mm) |
|---|---|---|
| 30 × 40 cm | 120 × 160 = 19,200 | 107 × 143 ≈ 15,300 |
| 40 × 50 cm | 160 × 200 = 32,000 | 143 × 179 ≈ 25,600 |
| 50 × 65 cm | 200 × 260 = 52,000 | 179 × 232 ≈ 41,500 |
| 60 × 80 cm | 240 × 320 = 76,800 | 214 × 286 ≈ 61,200 |

