After repeatedly drilling through various metal types with all selected models, we recommend the DeWalt Industrial Cobalt ...

There are a number of different types of drill bits. Steel Tooth Rotary Bits are the most common types of drill bits, while Insert Bits are steel tooth bit with tungsten carbide inserts.

Our favorite model was the Drill Doctor 750X because it was easy to use on different drill bit types and sizes, worked fast, and sharpened many of our bits to better-than-new condition.

When shopping for a countersink drill bit set, you need to consider materials, drill bit type, flutes and shanks, and many more factors that we’ve listed in this article. We delve into these ...