The Irwin 10234SM #4 Unibit Step Drill Bit is a high-quality drill bit suitable for various drilling applications. Made of steel with a silver color, this drill bit has a diameter range of 3/16" to 7/8" and a length of 16 inches. It is designed for use with a drill and is a single unit from the IRWIN brand. With a speed point design, this step drill bit is perfect for efficiently drilling holes in a range of sizes. Made in the United States, this durable and reliable tool is a must-have for any workshop or tool collection.