Made in the USA, Pro-Grade High Speed Steel Drill Bit Manufactured from, M2 steel, this black oxide drill bit offers high performance and durability, making it ideal for drilling wood, plastic, and common steels like flat bar, angle iron, and tubing Long-Lasting Surface Treatment The black oxide coating enhances the drill bits lifespan and performance, providing exceptional resistance to wear and tear during demanding projects Self-Centering Quick-Cut Points Featuring a 135-degree quick-cut point, this drill bit requires no center punch and effortlessly penetrates surfaces with less pressure, reducing drilling time and effort Precision Drilling with No Wandering Designed to prevent walking or wandering on the starting surface, this bit ensures precise drilling every time, even on the most challenging materials Aerospace-Grade Quality Engineered to meet Aerospace NAS 907-B specifications, this drill bit delivers professional-grade quality and reliability for any drilling task. Set Includes Metal index set includes 116 to 12 by 32nd pro grade drills.