How to drill holes in 38 thick steel plates?

General Purpose Milling Cutters, End Mills & Slot Drills slot drill sizes 2 FLUTE SLOT DRILL 34 DIAMETER · 2 FLUTE SLOT DRILL 58 DIAMETER · 2 FLUTE SLOT DRILL 12 DIAMETER · 2 slot screws What are the tolerances for various sizes of Drills Bits? ; > 3 ≤ 6, 0 +, 0 + ; > 6 ≤ 10, 0 +, 0 + ; > 10 ≤ 18, 0 +, 0 +

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