During his campaign and since taking office, President Donald Trump often repeated his desire to bring back the same “drill, ...

But like any other tool that alters materials ... you can wipe the tip and use it normally. To keep drill bits in tip-top shape, use them only to work on the material for which they're designed.

The shape of a drill bit is what makes it work ... which shouldn't make contact with any workpiece you're cutting. "Relief" here refers to creating space to reduce friction.