The 1/2" Stud and Joist Drill (DWD450) from DEWALT is an excellent, heavy duty tool for tough tasks. Its mechanical clutch prevents bit lock-up in a low gear while providing increased gear life. Powered by an 11 amp motor, it works great in high torque applications and boasts metal gear housing for durable use. It also has 2 variable speed ranges of 0 - 330 and 0 - 1,300 RPMs allow you to match appropriate speeds to the task.