Features Precision Cutting: The 4 spiral grooves ensure fast and efficient drilling, offering a smoother cutting experience. Perfect for swiftly slicing through stainless steel, wood and plastics. Robust Material: Crafted from M35 cobalt high-speed steel, this step drill bit is specifically designed to handle tough cutting jobs on materials like stainless steel and other metal plates with precision. Hardness Advantage: Boasting a high surface hardness of 89HRC, this robust step drill bit can effortlessly pierce harder materials, paving the way for higher cutting speeds and longevity. Versatile Sizing: This all-in-one step drill bit presents 9 hole sizes ranging from 1/4" to 3/4", optimizing your drilling work without the need for multiple drill bits. Secure Fit: The universal 1/4in shank is engineered for a snug fit with a wide variety of power tools, ensuring stability and confidence during your drilling tasks. Features: 1. 4 SPIRAL GROOVES: Four cutting flutes design ensure faster and smoother cutting. Feels like a hot knife cutting butter! 2. M35 COBALT HIGH SPEED STEEL DRILL BIT: Very suitable for cutting stainless steel, wood, plastic, aluminum plates, copper, and other metal plates. 3. 89HRC: With a surface hardness of 89HRC, this step drill bit can cut harder materials and achieve higher cutting speeds. 4. HOLE DIAMETER: With this step drill bit, you can complete holes with a diameter of 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4 inches. 5. 1/4IN SHANK: This drill bit with a standard 1/4in shank, ensuring a tight fit with corresponding power tools, choose with confidence! Specification: Item Type: Spiral Groove Step Drill Bit Material: M35, Cobalt Hole Diameter: 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4 inches Shank Diameter: 1/4 inch Package List: 1 x Step Drill Bit  1 x Storage Box Package List 1 x Step Drill Bit 1 x Storage Box