speed steel construction delivers a longer cutting edge life, maintaining sharpness even at extreme temperatures. Versatile step drill bits that can drill through stainless steel sheets, aluminum alloy, plastic, and wood, allowing you to use a single tool across multiple materials. Protective aluminum case included for easy carrying and organized storage. Double cutting blades provide faster, smoother cutting, while the 3sided shank design prevents slip in the drill chuck for reliable performance. Use scenarios Metal fabrication and panel work: drilling larger holes in stainless steel or aluminum sheets for brackets, grommets, or cable passthroughs. Wood, plastic, and mixedmaterial projects: creating clean holes in wood or plastic components for dowels, fasteners, or wiring channels. Home and maintenance: installing hardware on metal cabinets, HVAC panels, or aluminum trim where hole sizes vary.