Product details:

Large size general-purpose drills with round 1/2" reduced shank. Standard 6" overall length and 3-1/8" flute length for increased rigidity, less deflection and better hole accuracy. Standardized lengths result in minimal adjustment during tool changes in screw machines and machining centers. Ideal for portable drilling due to increased rigidity. Black oxide finish increases wear resistance and adds lubricity, improving chip flow. Use wherever maximum chuck capacity is 1/2". For drilling in carbon steel, allow steel, cast iron and wood. Made In USA.