Irwin 91142 21/32 in. Silver & Deming HSS Drill Bit, M-7 Black Oxide Finish

Irwin 91142 21/32 in. Silver & Deming HSS Drill Bit, M-7 Black Oxide Finish

The Irwin 91142 21/32 in. Silver & Deming HSS Drill Bit is engineered for precise, reliable drilling in wood, metal, and plastic. Machined from M-7 high-speed steel and finished with a 118° chisel-point tip, this bit is designed for clean, accurate starts on tough materials. A 1/2 in. reduced shank makes the 91142 compatible with all standard 1/2 in. drills, while the 3-flatted shank geometry improves chuck grip and reduces slippage during heavy-duty use. This model is offered alongside the 91164 option within Irwin's Silver & Deming HSS bit lineup, and the black oxide coating adds corrosion resistance for demanding trade, automotive, and fabrication work.

Key Features

• Trade Size: 21/32 in. cutting diameter with a 1/2 in. reduced shank, sized for use in all standard 1/2 in. drill chucks.
• Durable Construction: Manufactured from M-7 high-speed steel, delivering the abrasion resistance needed for demanding metal, wood, and plastic drilling jobs.
• 118° Chisel-Point Tip: The chisel-point tip design promotes clean, accurate starts and minimizes bit walking on hard or uneven surfaces.
• 3-Flatted Shank: The flatted shank profile provides a more secure grip in the chuck, reducing slippage and spin-out under load.
• Black Oxide Coating: A black oxide finish resists corrosion and extends bit life when working in shop or jobsite conditions.
• Twist Bit Design: Standard twist flutes clear chips efficiently for smoother, more consistent drilling performance.

Technical Specifications

• Warranty: NLW
• Bit Type: Twist
• Product Material Group: Metal
• Power Source: Non-Energy Using
• Country of Origin: China
• Battery Included: No

Typical Applications

• Metal Drilling and Metal Fabrication Work
• Automotive Repair and Maintenance Tasks
• Wood and Plastic Drilling Applications
• Heavy-Duty Professional Trade Use
• General Shop and Jobsite Drilling

Why Irwin?

Irwin builds the 91142 Silver & Deming drill bit from M-7 high-speed steel with a black oxide coating for corrosion resistance, giving tradespeople a bit engineered to withstand demanding metal fabrication and automotive work. The 3-flatted shank and 118° chisel-point tip are designed to deliver secure chucking and clean, accurate starts, and the matching 91164 option extends the lineup for broader drilling coverage. Backed by Irwin's reputation for durable tool construction, the 91142 is built to perform reliably in professional shop and jobsite environments.