Drills are probably one of the most useful household tools to have on hand for any project. For basement finishing, it's smart to have a corded and a cordless drill. Drills that plug in are a lot more powerful than their cordless counterparts, so they're a necessity for drilling stubborn materials. And, if you have a cordless drill, you can skip the purchase of a screw gun, because they make a great screwdriver. That will not only save you time but energy, too, by eliminating the repetitive motion of using a manual Phillips head. Just be sure to have at least one extra battery on the charger at all times.