I had to drill holes in the steel I-beams in my basement so I could attach the 2x4's with self-tapping screws. These drill bits do their job well and don't dull quickly.
πͺ Bi-Metal Cutting Blades: Imachinist S933414 - Enhancing Precision and Performance
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Enhanced Cutting Efficiency with Olson FB23370DB 0 025 2 Inch Blade
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