These are robust steel drill bits, good for drilling into wood, plastic or metal. One downside: At high drill speeds, they can overheat and soften, becoming dull. This is especially common when ...

It turns out that a hot solution of alum (ammonium aluminum sulfate), which is available in the spice rack of your local supermarket, will dissolve the steel drill bit without reacting with the brass.

Forging, casting, and cutting are some methods of getting the metal ... the steel, and the results speak for themselves. With the liquid nitrogen treatments the bits were easily able to drill ...

DeWalt makes some of the best cordless drills in the business, so why not equip yours with the proper add-ons? Instead of opting for cheaply-made drill bits that usually become dull or break quickly, ...