This Nitro Tap & Drill Set from Drillco Cutting Tools is expertly designed to cater to a variety of threading operations, whether you're working on through or blind holes. The 18-piece set features high-speed steel construction, providing exceptional durability and cutting performance, while the black oxide finish enhances corrosion resistance and reduces friction during use. As part of the robust 400N series, this collection is a reliable addition to any toolkit, ensuring precision and efficiency for both professional and DIY projects.