Sutton Drill Step HSS 4-12mm 9-Step Spiral Flute D50441209For use in sheet metal, aluminium, plastic & fibre glass, ideal for sheet metal without pre drilling. During drilling, the next step deburrs the previously drilled hole. Diameters 4, 5, 6, 7, 8, 9, 10, 11, 12mm Shank Flat Range 4 12mm Steps 9
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