Coated carbide is the best. Uncoated is next.
Cobalt Drill Bits Ideal for drilling into hardened steel.
you'll want to heat the metal first on hardened steel...then proceed to the drill press with a good quality bit. no made in china or other cheap bits....a good bit will run aprox 8.00 each ....by tyler beyers abc seamless fargo,nd
You use a standard HSS bit for mild steel.
One would employ a tool with a diamond drill-bit to a material that was extra hard, such as a diamond or hardened steel beam.
A tungsten coated drill bit.
No, it takes a special drill bit with a hardened tip.
with a drill bit
Stainless Steel.
Yes, there is. You use a tungsten or cobalt coated drill bit for this.
A titanium or cobalt drill bit.
A 'unibit is a 'stepped steel drill bit that can drill any size of hole in softer materials.