These powerful drill bits for cast iron, aluminum, and even stainless steel are made of a steel ... to see which performed ...

If you’re drilling very hard materials like cast iron or stainless steel, an angle of 135 degrees is recommended. Q. Is it easy to resharpen drill bits ... re not sharp. Best bang for your ...

Men’s Journal aims to feature only the best ... bits are made for maximum durability and feature a pilot point design with a split tip that makes drilling through hard metals or stainless steel ...