What Does the Color of Drill Bits Mean? #Video

Have you ever noticed that drill bits come in different colors? Some are silver, black, gold, or bronze, but what do these finishes actually mean? Are they simply decorative, or do they indicate differences in the materials and coatings used to make them? In this episode of History of Simple Things, we explore the meaning behind drill-bit colors, including bright-finish steel, black oxide, titanium nitride, and cobalt-alloy steel. We'll also look at how these finishes affect heat resistance, friction, and durability, along with why the shape of a drill bit matters just as much as its appearance.