Methodology guide
Annular diameter ladder and safety notes.
Calculator
Magnetic drill capacity calculator
Enter required annular hole diameter in mm. Get the smallest 35, 50, or 60 mm coring class or NO_MATCH.
Result
Match hole_mm to the smallest class whose published coring max covers it: 35 · 50 · 60 mm. Worked check: 25 mm → 35 mm class.
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