Bosch BL4148 21/64″ Black Oxide Sp Jobber (Bulk)

This set of six 21/64-inch black oxide drill bits from Bosch combines exceptional durability with advanced engineering for a variety of drilling needs. Designed with a speed helix that allows for three times faster drilling compared to standard bits, these jobber-length bits are suitable for a wide array of materials including steel, aluminum, PVC, and various woods, ensuring versatility in every project. The black oxide surface coating not only helps in reducing heat but also extends the life of the bits, allowing them to last 50% longer than traditional high-speed steel alternatives. Their single-ended twist design and standard shank diameter make them compatible with common drills, providing an efficient and reliable solution for both professional applications and home improvement tasks.