Step Drill Bits Inch Sizes are designed to provide progressive diameter drilling in inch units, suitable for various materials such as metals, plastics, and composites. The high-speed steel or coated construction maintains durability and cutting sharpness during continuous use. Step geometry allows sequential drilling of multiple hole sizes without changing drills, saving time and increasing productivity. Tapered shanks ensure stable mounting in drill presses, lathes, or CNC machines, minimizing vibration and ensuring precise, clean holes in industrial, fabrication, and prototyping environments.