KITPLANES editor at large Paul Dye explains the best times to use the so-called step drill (also called a UniBit) for drilling larger holes in aluminum. This is one of those tools that will save you time and effort in your aircraft build.
This series is sponsored by Aircraft Spruce & Specialty.
![[Credit: Mike Davenport]](https://www.kitplanes.com/wp-content/uploads/2026/02/DSC_0053.jpg?w=324&h=160&crop=1 "Pre-War Porterfield")
Nice and informative video. I’ve never used a step drill bit before.
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