• Left-hand spiral design: Ideal for removing broken studs, screws, and bolts, as well as for use in screw machine applications. • High-speed steel construction: Provides durability and a combination of strength, heat resistance, and wear resistance. • 118-degree conventional point: A general-purpose point angle suitable for a wide range of materials. • Bright finish: The polished surface improves chip flow, especially in soft materials like aluminum, copper, and brass. • Jobber length: The standard drill bit length provides a balance of reach and rigidity for various drilling tasks. • 21-piece set: Includes fractional sizes from 1/16" to 3/8" in 1/64" increments for comprehensive coverage. • Durable metal index case: Keeps bits organized and protected, with each hole precisely sized for quick and accurate selection.