Step Drill Bits Inch 1/4-1/2 provide accurate drilling of multiple hole diameters ranging from 1/4 inch to 1/2 inch. Constructed from high-speed steel or coated variants, they resist wear and maintain sharp edges for repeated use. Step geometry allows sequential drilling without changing tools, while tapered or straight shanks provide secure mounting in hand drills, drill presses, or CNC machines. Spiral flutes improve chip evacuation and reduce heat. Ideal for fabrication workshops, prototyping labs, and professional or DIY projects requiring precise inch-sized holes.