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Descriptions: 3Pcs HSS Round Shank Titanium Coated Quick Change Step Drill Bits 3/16-1/2 1/8-1/2 1/4-3/4 InchSpecification:Product NameStep Drill Bits MaterialHigh Speed Steel 4241Suitable ForUsed for the hardness of the material which is below 25°, like iron borad, steel board, PVC board, Insulatio..