The high/low tee drill is a great drill for those players that cast their bat. This drill is great for hitters who cast, or have a really long swing.
This drill requires the use of 2 tees, and two baseballs. To set the drill up, place one tee in front of the other tee, at about the same height. Place a ball on both tees. Have the hitter take a swing, keeping his hands in to avoid hitting the first tee, and extending through the hitting zone to make contact with the ball on the second tee.