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The hardness of it is about 89HRA. Hardness: HRA.89. 6Pcs M3-M10 Thread Cutter Tap Drill Bit Set HSS 1/4" Hex Shank Countersink Tool. M35 Cobalt Step Drill Bits 4-12/4-20/4-32mm HSS Spiral Groove Hex Shank Drills.
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