The article discusses the five worst jobs to use an impact driver for DIY projects, including those involving delicate materials, such as small screws, brittle wood, or miniature projects. The main difference between the two tools is that impact drivers add the "impact" to the rotational force found in drills, drivers, and combination drill/driver tools. This makes them a poor choice for projects that require precision and fine control, use brittle materials, or have other requirements. The article also notes that impact-rated bits are designed for the high impact and high torque of the impact driver. If you don't know if a bit fits in the impact drivers, it should be used only for those with a regular power driver or a drill. Some impact drivers offer a small degree of control over torque, but most don't have enough control.