3PCS Step Drill Bit Set – Titanium Coated HSS Multi-Step Bits (3–20mm) for Wood, Aluminum, Plastic – 6.35mm Hex Shank for Power Tools
3–12mm (15 steps), 4–12mm (5 steps), and 4–20mm (9 steps)—perfect for drilling clean, burr-free holes in one pass without switching tools.