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Drillforce Tools M42 Cobalt Drill Bit Set,HSS-CO Drill Set 0.5-10MM, for Drilling on Hardened Steel, Cast Iron & Stainless Steel - AliExpress
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2/Pack Solid Carbide Drill Bit for Hardened Steel Hard Ness HRa 91.3 Aerospace Standard K20 Tungsten Carbide Jobber Length Twist Drill for Metal 118 Degree Four Facet Point Fractional Size (1/4") - Amazon.com
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7 Pcs. M.A Ford Hi Roc Series 200 3D Straight Flute Solid Carbide Drill Set for 42-65 HRc Hardened Steel
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