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FOUR SPIRAL FLUTES: The four cutting blade design guarantees faster and smoother cutting. Feels like a hot knife through butter! TiAlN coating: with 89HRC surface hardness, harder materials can be cut and higher cutting speeds can be achieved. M35 Cobalt HSS Step Drill Bit - Perfect for 3mm thick stainless steel/metal sheet/wood/plastic/aluminum sheet/copper and other metal sheets. 9 STEP SIZES - Includes 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4". GUARANTEE - If for any reason you are not completely satisfied, please contact us for 100% refund or replacement. If the hex shank breaks, please contact us for replacement.