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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 12 STEP SIZE - Includes 3/16",1/4", 5/16", 3/8", 1/2", 9/16", 5/8", 11/16", 13/16", 7/8"