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M35 COBALT HSS STEP DRILL - Prefect for Stainless Steel/Metal Sheet/Wood/Plastic/Aluminum Sheet/Copper and other metal sheets. ALUMINUM TITANIUM NITRIDE COATING - With 35 Gigapascal(GPa) Nano Hardness harder materials can be cut and higher cutting speeds can be achieved. FOUR SPIRAL FLUTE - Four cutting blades design guarantees a faster and smoother cutting. Feels like a hot knife through butter! 1/4" HEX-SHANK QUICK CHANGE - Quick release slot to eliminate slipping 13 STEP SIZES - Includes from 5mm to 35mm (5, 7.5, 10, 13, 16, 19, 21, 23, 26, 29, 31, 33, 35)