A studio photograph of the 21-piece Bosch black oxide drill bit set housed in its durable, clear-faced plastic storage case with retail labeling.
A studio photograph displaying the full 21-piece assortment of black oxide jobber length twist drill bits arranged by size from largest to smallest.
An instructional graphic showing various metal stocks, including stainless steel tubing and diamond plate, with text stating the bits are best for cutting metals like stainless steel.
A close-up studio photograph of the spiral flutes on a black oxide drill bit, featuring text that identifies the design as a Long Flute for effective material removal and universal drilling.
A close-up studio photograph highlighting the 135-degree split-point tip of a black oxide drill bit, with text overlaying the image stating No Skate Tip for clean accurate starts.
A studio photograph of the 21-piece Bosch black oxide drill bit set housed in its durable, clear-faced plastic storage case with retail labeling.
A studio photograph displaying the full 21-piece assortment of black oxide jobber length twist drill bits arranged by size from largest to smallest.
An instructional graphic showing various metal stocks, including stainless steel tubing and diamond plate, with text stating the bits are best for cutting metals like stainless steel.
A close-up studio photograph of the spiral flutes on a black oxide drill bit, featuring text that identifies the design as a Long Flute for effective material removal and universal drilling.
A close-up studio photograph highlighting the 135-degree split-point tip of a black oxide drill bit, with text overlaying the image stating No Skate Tip for clean accurate starts.
BOSCH

Bosch 21 Piece Black Oxide HSS Jobber Length Twist Drill Bit Set with 135 Degree Split Point Tip and Three Flat Shank for Wood Plastic Metal

In stock
SKU: BL21A
$23.79

Description

Precision Starts and Extended Life: The Ultimate General-Purpose Drilling Solution for Professionals

The Bosch 21-Piece Black Oxide Metal Drill Bit Set is meticulously engineered to meet the rigorous demands of contractors, electricians, and professional tradespeople. Featuring a premium black oxide coating, these High-Speed Steel (HSS) bits are designed to significantly reduce friction and heat buildup, providing a longer service life than standard drill bits. Whether you are drilling through light-gauge metal, PVC, fiberglass, or hardwoods, the 135-degree split-point tip ensures a "no-skate" start, allowing for immediate penetration and clean, accurate holes without the need for a center punch.

Beyond superior cutting performance, this jobber length set prioritizes secure handling and ease of use. Bits sized 3/16-inch and larger feature a specialized three-flat shank design, which promotes a superior grip within the drill chuck to prevent slipping under high-torque applications. Each bit is equipped with high-visibility markings for rapid diameter identification, ensuring you spend less time searching and more time working. Housed in a durable case, this comprehensive assortment covers the most common drilling diameters, making it the perfect universal kit for general-purpose maintenance and construction projects.

Key Features

  • 135-Degree Split-Point Tip: Engineered for clean, accurate starts that eliminate skating on hard surfaces.
  • Black Oxide Coating: Specialized finish generates less friction and extends the overall life of the bit.
  • Three-Flat Shank: Promotes a better grip and prevents bit slippage in the chuck on sizes 3/16" and larger.
  • Universal Applications: Ideal for general-purpose drilling in wood, plastic, fiberglass, and light-gauge metal.
  • High-Visibility Markings: Clearly marked diameters allow for fast and easy bit selection.
  • Right-Handed Rotation: Standard right-hand twist geometry optimized for most drill drivers.

What's Included

  • (2) 1/16 In., (2) 5/64 In., (1) 3/32 In., (1) 7/64 In.
  • (2) 1/8 In., (1) 9/64 In., (1) 5/32 In., (1) 11/64 In.
  • (2) 3/16 In., (1) 13/64 In., (1) 7/32 In., (1) 15/64 In.
  • (2) 1/4 In., (1) 5/16 In., (1) 3/8 In., (1) 1/2 In.
  • (1) Durable Storage Case

Specifications

Material Black Oxide Coated HSS
Bit Length Jobber Length
Set Count 21 Pieces
Tip Geometry 135-Degree Split-Point
Shank Type Three-Flat (3/16" and larger)
Max Drilling Depth 3.0 Inches
Compatible Tools Drill Drivers
Wood/PVC/Fiberglass Use Yes
Metal Use Yes (Light-Gauge Only)
Rotation Right Handed

Pro-Tip: When drilling through light-gauge metal, use a lower speed setting on your drill and apply a drop of cutting oil to the tip. This works in tandem with the friction-reducing black oxide coating to prevent overheating the bit and ensures the cleanest possible exit hole.