The Klein Tools 3-Step Drill Bit is a versatile and durable tool suitable for drilling in various materials such as aluminum, steel, plastic, and wood. With a size range of 7/8-inch to 1-3/8-inch, this double-fluted step drill bit features a hex shank type for secure fitting in the chuck. Made of M2 steel with a silver finish, this high-quality drill bit is designed for precision drilling and comes in a single count package. Perfect for professionals and DIY enthusiasts alike, the Klein Tools 3-Step Drill Bit is a reliable and efficient tool for any drilling project.