5 Piece HSS Black & Gold Quick Change Hex Shank Step Drill Bit Set (Sizes #1 to #5

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Step drills have single radial concave flutes to create a perfectly round hole in metal, plastic wood and other thin materials without center punching. Constructed of industrial gr ade high-speed molybdenum steel, heat-treated and temperature for long life. Self-starting tip. No center punching needed. Automatically deburrs top side of hole. Ideal for steel, copper, aluminum and other thin materials. They are Black and gold surface treated with a 1/4" quick change hex shank. Show more