Bosch BL4139 3/16″ Black Oxide Spjobber (Bulk)

The 12 pc. 3/16 In. x 3-1/2 In. Fractional Jobber Black Oxide Drill Bits from Bosch are engineered for exceptional performance in a variety of materials, including steel, aluminum, and various woods. Each bit features a black oxide surface coating, which not only enhances durability but also helps reduce heat during drilling, ultimately extending the lifespan of the bits. Designed with a speed helix, these drill bits are optimized for efficiency, enabling faster drilling—up to three times quicker than standard counterparts. Whether you’re working with composites or more conventional materials, this versatile set is an excellent choice for both professional and DIY applications, offering reliable operation and improved drilling experiences.