warning after drilling a hole in the floor with a cordless drill, do not, i repeat do not sit your drill on the rop of the computer desk sitting next to you (thats almost as tall as you by the way) and go back to working. chances are youll bump the desk and the drill (with 18in 3/8 bit) will fall, snaging everything up there and pull it down on your face. and cordless drills are heavy. the batteries are hard. they will split your lip. you will spit blood and pray you didnt loose a tooth. now that said, it still hurts the day after.