cobalt drill bits are the only answer. These powerful drill bits for cast iron, aluminum, and even stainless steel are made ...

Cobalt bits are expensive and best choice for ... Coatings are advantages, but not permanent solutions to drilling problems. Drill stainless steel with care. Once a hole is started in stainless ...

The DeWalt 14-Piece Cobalt Alloy Steel Drill ... or stainless steel easy while minimizing bit walking. You can easily swamp them out thanks to the patented bit-bar design, too. These bits mean ...

I'm trying to figure out which type of bit is best for drilling thru about 1/4" of galvanized steel. I recently used a standard carbon-steel bit to drill ... Cobalt steel<BR><BR>Looking at 1/4 ...