Step Drill Bits are the best bits that are used to drill a metal up to 1/4 of an inch thick. These step drill bits are designed to drill and ream holes through thin materials, such as sheet metal, to a specific diameter. The step drill bit can create holes in a range of sizes without requiring the user to swap out bits in the tool. It enlarges a hole as the bit drills through the sheet metal. Titanium Step Drill Bits increase the cutting speed with self-centering and prevent walking. It allows you to drill multiple-sized holes with one bit. Each step on these bits is larger in diameter.