The step drill bit is crafted from durable M35 Cobalt HSS material, providing exceptional strength and hardness (89HRC) for cutting through various materials, including stainless steel, sheet metal, wood, plastic, aluminum, copper, and more. Its four spiral groove design ensures faster and smoother drilling, while the 1/4-inch shank diameter offers compatibility with a range of power tools. With its versatility, ease of use, and sturdy construction, this step drill bit is an ideal choice for both professional and DIY enthusiasts.