Effectively, dull drill bits may shorten the lifespan of your machine. And whether you'd like to admit it or not, there can also be instances of broken drill bits, too (don't worry, we won't tell ...

Instead of opting for cheaply-made drill bits that usually become dull or break quickly, you can get this 21-piece set of DeWalt bits on Amazon for less than you'd think thanks to a limited-time deal.