Step Drill Bit Adjustable Size features a unique step geometry that allows drilling a range of diameters with a single tool. High-speed steel or coated construction ensures durability and maintains sharp edges during repeated use. Tapered or straight shanks provide secure mounting in drill presses, hand drills, or CNC machines. Spiral flutes improve chip removal and reduce heat buildup, enabling clean and precise holes in metals, plastics, and wood. Ideal for workshops, fabrication shops, and DIY projects requiring variable hole sizes without frequent tool changes.