Step drills are preferably used on thin materials, which corresponds to the description of sheet metal.Sheet metal work also requires a number of different sized holes, meaning workers would have to constantly change their bits.Since the single-step drill bit can change to a number of different sizes, you'll save time using these drill bits for sheet metal work.Another purpose of step drills is to use them as countersinks.Since they are so versatile, they work great for securing screws and fixings under a surface.When drilling holes in the opposite side of materials, the small bits are for doing this job.This is a good technique when reinforcing bolts and other fasteners, as well as adding stability to various construction projects.Another great use for step drill bits is on automotive repair projects.Most body shops use many multi-stage bits for car restoration projects, making it an expensive and time-consuming job.However, with step drills, they can stick with just one drill bit and save time with fewer bits needed.