The OEM TOOLS 3 Piece Spiral Step Drill Bit Kit makes it easy to drill 28 hole sizes using just three step bits. This titanium drill bit set is suitable for home improvement, DIY, building, and engineering projects using applicable materials, such as stainless steel, copper, brass, aluminum, plastic, laminates, and more. These step bits for stainless steel, copper, and aluminum allow the user to enlarge existing holes or drill new holes. And each titanium step bit comes with clearly marked hole sizes for quick and easy selection of the correct spiral step bit for the job. Every spiral drill bit in this drill driver bit set features a 2-flute spiral for longer life, faster drilling, and less vibration, and the split point generates less heat while increasing speed. The hex shank on these step drill bits for metal, plastic, and laminates fit into power tools securely, preventing slippage while you work. Our titanium step drill bit set is constructed from high-speed steel, ensuring these step bits for metal last as long as you need them.