When I was drilling through a hardened steel I went to a specialty metals shop and they recommended cobalt bits. They were also much cheaper than lows but unfortunately have since gone out of business ...

ATLANTA, May 6, 2025 /PRNewswire/ -- Diablo Tools ("Diablo"), which offers a solution-oriented range of best-in-the-world and best-for-our-world products for the professional user, unlocks new levels ...

The secret to the Metal Demon™ Drill Bits for Mild, Hardened and Stainless Steel 's superior performance is Diablo's commitment to industry-changing design combined with Diablo's proprietary Thermal ...

Diablo's revolutionary Metal Demon™ Drill Bits for Mild, Hardened and Stainless Steels combine the functionality of all three-bit types while also enabling electrifying results. The 3-in-1 bit ...