Best CarbideKlot
Klot Carbide Drill Bit for Hardened Steel
- Solid carbide
- For hardened steel over 60 HRC
MIMilwaukee
Milwaukee
Milwaukee 48-89-4631 THUNDERBOLT Cobalt Drill Bit Set
- THUNDERBOLT cobalt
- Milwaukee quality
- 15-piece
Sponsored link · confirm price and availability on Amazon · updated
On this page
Is the Milwaukee 48-89-4631 THUNDERBOLT Cobalt Drill Bit Set worth it?
Yes, for the right buyer. The Milwaukee 48-89-4631 THUNDERBOLT Cobalt Drill Bit Set ranks #9 in our Best Drill Bits for Hardened Steel 2026 list. Its biggest strength: milwaukee brand consistency for Milwaukee drill users. The main caveat: 15-piece vs Irwin 29-piece coverage.
Specs that matter
Key features
- THUNDERBOLT cobalt
- Milwaukee quality
- 15-piece
The trade-offs
Pros & cons
Pros
- Milwaukee brand consistency for Milwaukee drill users
- THUNDERBOLT cobalt rated for stainless and hardened steel
- 15-piece covers common sizes
Cons
- 15-piece vs Irwin 29-piece coverage
Fit check
Should you buy the Milwaukee 48-89-4631 THUNDERBOLT Cobalt Drill Bit?
Buy it if you're…
- Shopping for hardened steel 2026
Think twice if this matters to you
- 15-piece vs Irwin 29-piece coverage
Where it ranks
Featured in 1 best-of list
| List | Rank |
|---|---|
| Best Drill Bits for Hardened Steel 2026 | #9 / 10 |
Cross-shop
Alternatives to the Milwaukee 48-89-4631 THUNDERBOLT Cobalt Drill Bit Set
Products ranked near it in our research, each better for a slightly different buyer.
Buying advice: power tools
- Major platforms each cover hundreds of tools. Choose one with the specialty tools you may need later.
- Brushless motors are more efficient and durable. Brushed tools are fine for occasional light use.
- Kits include batteries and a charger. Once you own batteries, bare tools are much cheaper.
- 12V tools are compact for light work. 18V or 20V max tools handle most home projects. Higher-voltage platforms suit heavy cutting.
- Check tool and battery warranty lengths and whether registration is required.
Read the full guides
Answers
Milwaukee 48-89-4631 THUNDERBOLT Cobalt Drill Bit Set: common questions
Is the Milwaukee 48-89-4631 THUNDERBOLT Cobalt Drill Bit Set worth buying?
Yes, for the right buyer. The Milwaukee 48-89-4631 THUNDERBOLT Cobalt Drill Bit Set ranks #9 in our Best Drill Bits for Hardened Steel 2026 list. Its biggest strength: milwaukee brand consistency for Milwaukee drill users. The main caveat: 15-piece vs Irwin 29-piece coverage.
Who is the Milwaukee 48-89-4631 THUNDERBOLT Cobalt Drill Bit Set best for?
Based on our research it suits hardened steel 2026. It's ranked #9 of 10 in our Best Drill Bits for Hardened Steel 2026 list.
What are the downsides of the Milwaukee 48-89-4631 THUNDERBOLT Cobalt Drill Bit Set?
The main trade-offs owners and reviewers point to: 15-piece vs Irwin 29-piece coverage.
What are the key features of the Milwaukee 48-89-4631 THUNDERBOLT Cobalt Drill Bit Set?
THUNDERBOLT cobalt, Milwaukee quality and 15-piece.
What are the best alternatives to the Milwaukee 48-89-4631 THUNDERBOLT Cobalt Drill Bit Set?
Worth comparing: Klot Carbide Drill Bit for Hardened Steel, Drill America 1/4 HSS Cobalt Drill Bit and Norseman Viking Drill Bit Ultra-Bit M42 Cobalt. Each ranks near it in our research for a slightly different buyer.
Where can I buy the Milwaukee 48-89-4631 THUNDERBOLT Cobalt Drill Bit Set?
It's sold on Amazon. Prices and stock change often, so check the current listing before you buy, our link takes you straight to it.
Which drill is more powerful, DeWALT or Milwaukee?
At comparable price tiers, Milwaukee M18 FUEL brushless drills are more powerful than DeWALT XR brushless. At budget tiers (brushed motors), the difference is smaller. For drilling through concrete and hardwood repeatedly, Milwaukee FUEL has the edge. For standard home use (drywall, softwood framing, assembly), the difference is imperceptible.
If I already have DeWALT batteries, should I switch to Milwaukee?
The battery platform transition cost makes switching rarely worthwhile. If you have DeWALT batteries, buy DeWALT tools. The performance difference between professional-tier DeWALT XR and Milwaukee FUEL is real but small, not worth replacing a battery library over.
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