Milwaukee 48-89-2318 21/64" Cobalt Drill Bit, Red Helix Design

Milwaukee 48-89-2318 21/64" Cobalt Drill Bit, Red Helix Design

The Milwaukee 48-89-2318 21/64" Cobalt Red Helix drill bit is a professional-grade metal drilling accessory engineered for durability and precise, repeatable performance on the jobsite. Sized at 21/64" for accurate hole diameters, this bit features cobalt construction that stands up to the heat generated when drilling through hardened metals, stainless steel, and other tough materials that quickly wear down standard high-speed steel bits. The bit's Red Helix flute geometry, a hallmark of Milwaukee's metal drilling line, is engineered to help clear chips efficiently and maintain a consistent cutting edge throughout extended use. Whether working on electrical enclosures, sheet metal panels, HVAC ductwork, or structural steel, the 48-89-2318 delivers the reliability professionals expect from Milwaukee accessories.

Key Features

• Trade Size: 21/64" diameter delivers precise, repeatable hole sizing for applications that call for an exact fit, from panel knockouts to bracket mounting.
• Durable Construction: Cobalt material formulation increases resistance to heat buildup and wear, helping the bit hold its cutting edge when drilling through stainless steel, cast iron, and other hardened metals.
• Red Helix Flute Design: Milwaukee's engineered Red Helix geometry is designed to improve chip evacuation and reduce binding for smoother, more efficient cuts in metal.
• Professional-Grade Performance: Built for contractors, electricians, and metalworking professionals who rely on consistent bit performance across repeated daily use.
• Universal Fit: Designed to work with standard corded and cordless drill and driver chucks for flexible use across jobsite tools.
• Metal Drilling Application: Purpose-built for drilling metal, making it a practical addition to any professional's drill bit set.

Technical Specifications

• Refer to manufacturer documentation for complete technical specifications.

Typical Applications

• Drilling Holes in Electrical Enclosures and Panels: creates precise openings in metal boxes and enclosures during electrical installation work.
• Metal Fabrication and Sheet Metal Work: suited for general metalworking tasks requiring clean, accurate holes.
• HVAC and Plumbing Installations: supports drilling through metal ductwork, brackets, and mounting hardware.
• Stainless Steel and Hardened Metal Drilling: cobalt construction is designed to handle tougher metal substrates than standard bits.
• General Contractor and Maintenance Applications: a versatile addition to any professional's metal drilling toolkit.

Why Milwaukee?

Milwaukee is a trusted name in professional-grade tools and accessories built to withstand the demands of daily jobsite use. The 48-89-2318 cobalt Red Helix drill bit combines heat- and wear-resistant cobalt construction with Milwaukee's engineered flute design to deliver dependable performance when drilling through metal. For contractors and tradespeople who need accessories that hold up to repeated professional use, Milwaukee's cobalt drill bit lineup, including the Red Helix design, offers the reliability the brand is known for on job sites.