You can drill into cast iron by using any type of drill bit for metal. Don't forget to use cutting fluid if you're drilling many holes. Always use a clamp or vice when you're drilling into any surface. Wear safety goggles, gloves, and clothing.

What is the best drill bit for cast iron?

The best drill bit to use for cast iron is a cobalt bit with a 135-degree point angle. The angle is sharper than that on a conventional bit, making drilling faster and more accurate. Cobalt bits are brass-colored. As an alternative, you can also use a gold-colored titanium nitride bit.

What drill bit goes through cast iron?

The Comoware Cobalt Drill bits are industry-leading heat-resistant drill bits, which gives you full control to drill into cast iron. Having an abrasion resistance feature, the bits will last for days without you even noticing it. Turns out, a precise 135-degree split point prevents walking and drills faster.