Milwaukee 48-89-9221 3-Piece B...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$144.33
Milwaukee 48-89-9221 3-Piece Black Oxide Steel Dual-Flute Step Drill Bit Set

Milwaukee 48-89-9221 3-Piece Black Oxide Steel Dual-Flute Step Drill Bit Set

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Model: 48-89-9221

In Stock (leaves warehouse same day if ordered before 3pm ET)

$144.33
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Milwaukee 48-89-9221 3-Piece Black Oxide Steel Dual-Flute Step Drill Bit Set

The Milwaukee 48-89-9221 3-Piece Black Oxide Steel Dual-Flute Step Drill Bit Set is designed to give tradespeople and DIYers a versatile, reliable way to drill clean, accurately sized holes in a single pass. This 3-piece set is manufactured from black oxide steel, a material chosen for its resistance to heat buildup and wear during repeated drilling cycles. Each bit in the set features a dual-flute design that helps evacuate chips efficiently, resulting in smoother cuts, reduced bit walking, and improved overall accuracy compared to single-flute alternatives. Because each step drill bit steps up through multiple diameters along its length, this Milwaukee set lets users drill a range of hole sizes without constantly swapping tools, saving time on the job. Whether used for electrical, HVAC, automotive, or general metalworking tasks, this set is built to be a dependable addition to any tool collection.

Key Features

  • 3-Piece Drill Bit Set: The Milwaukee 48-89-9221 set includes three step drill bits, giving users a range of stepped hole diameters covered across the set for greater versatility on the job.
  • Black Oxide Steel Construction: Each bit is manufactured from black oxide steel, a durable material known for its resistance to wear and heat generated during repeated drilling applications.
  • Dual-Flute Design: The dual-flute geometry is engineered to clear chips more efficiently than single-flute step bits, helping to produce cleaner, more accurate holes with less binding.
  • Black Oxide Finish: The black oxide surface treatment helps improve corrosion resistance and reduces friction as the bit cuts through material, extending usable tool life.
  • Stepped Bit Profile: The stepped design allows each bit to drill progressively larger holes along its length, reducing the number of bit changes needed to complete a job.
  • Milwaukee Reliability: Backed by the Milwaukee brand, this set is built to meet the demands of professional trade work as well as everyday DIY projects.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Sheet Metal Fabrication and Enlarging Pre-Drilled Holes
  • Electrical and HVAC Installation Work
  • Automotive Repair and Metalworking Projects
  • General Maintenance and Repair Tasks
  • Professional Trade and DIY Job Sites

Why Milwaukee?

Milwaukee has built a reputation among professional trades for delivering tools engineered to perform under demanding job-site conditions. The 48-89-9221 step drill bit set's black oxide steel construction and dual-flute design reflect Milwaukee's commitment to engineering tools that hold up to repeated use while maintaining cutting performance. For professionals and serious DIYers who need dependable performance from their cutting tools, the Milwaukee 48-89-9221 3-Piece Step Drill Bit Set offers a trusted option backed by the Milwaukee name.

Manufacturer Resources

Product Specs

list_batch:
MWK-20260918
Product Type:
Drill Bit Set
Product Finish:
Black Oxide
Configuration:
3-Piece Set
Department:
Electrical
Product Subgroup:
Drill & Driver Bits
Product Material:
Steel
Product Color:
Black
Product Group:
Power Tools & Accessories
Country Of Origin:
United States

Milwaukee 48-89-9221 – Frequently Asked Questions

1) Are these Milwaukee step bits any good for punching knockouts in sheet metal enclosures?
That is the main use. The 48-89-9221 bits are made for sheet metal work, including enlarging holes that are already drilled, and the description calls out electrical and HVAC installation directly. The stepped profile means a single bit gives you a clean, correctly sized hole in one pass rather than working up through twist bits.
2) What is included in the Milwaukee 48-89-9221 step drill bit set?
Three step drill bits, each stepping up through multiple diameters along its length. Because one bit covers several hole sizes, you swap tools less often on a panel or enclosure job. Milwaukee catalogs it as part number 48-89-9221.
3) What is the difference between a dual-flute step bit and a single-flute one?
Two flutes clear chips faster than one. On the Milwaukee 48-89-9221 bits, that dual-flute geometry is what reduces bit walking at the start of the cut and keeps the bit from binding as it steps up, so the hole comes out rounder. Single-flute step bits pack chips more readily in thicker or gummier stock.
4) Is black oxide the right coating for a step bit, or should I be looking at titanium?
Black oxide is a surface treatment over steel that cuts friction and adds corrosion resistance, which is why it holds up through repeated drilling cycles in mild steel and sheet metal. The 48-89-9221 set is black oxide over steel throughout. For heavy production in harder alloys a coated premium bit does more, but for electrical and HVAC panel work black oxide is the standard choice.
How fast can I get the Milwaukee 48-89-9221 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Milwaukee 48-89-9221 come with a warranty?
Absolutely. The Milwaukee 48-89-9221 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Milwaukee 48-89-9221?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Milwaukee 48-89-9221 from ZenSupply?
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