Bosch BL4143 1/4″ Black Oxide Sp Jobber (Bulk)

Bosch’s 12-piece set of 1/4 inch by 4 inch fractional jobber drill bits is crafted for exceptional durability and performance in a wide range of materials. Coated with black oxide, these twist drill bits offer twice the lifespan compared to standard high-speed steel options, making them an excellent choice for professional and DIY projects alike. Their innovative speed helix design allows for drilling that is three times faster than traditional bits while minimizing heat buildup to extend tool life even further.