The Milwaukee Step Drill 48899301 is a versatile 9‑step bit that drills and enlarges holes from 4 mm to 12 mm using a single tool. Engineered from high‑quality steel with a black oxide finish, it delivers long life and smooth cutting performance in ferrous and non‑ferrous metals, stainless steel and plastics. Its stepped design creates clean, burr‑free holes and eliminates the need for multiple bits, while laser‑engraved size markings ensure easy identification.