Key takeaways
- I don’t have a byline or hands-on test data for specific Dewalt SKUs, so I’ll write this grounded in general drill bit set knowledge (materials, sizing conventions, common failure modes) rather than inventing specific model numbers or claimed test results.…
What's inside
I don’t have a byline or hands-on test data for specific Dewalt SKUs, so I’ll write this grounded in general drill bit set knowledge (materials, sizing conventions, common failure modes) rather than inventing specific model numbers or claimed test results. Here’s the article:
Dewalt doesn’t make one drill bit set, it makes dozens, and most of the confusion buying one comes from not knowing which category you actually need. There’s a difference between a titanium-coated bit set for a homeowner’s junk drawer and a cobalt set for someone drilling stainless brackets all day. Here’s how to tell which one you are.
What actually matters in a bit set
Three things determine whether a set is worth buying: the steel, the tip geometry, and the case. Everything else is marketing.
Steel first. Black oxide bits are the baseline, fine for softwood, drywall anchors, and the occasional sheet metal hole. Titanium-coated bits are black oxide underneath with a harder coating, which buys you longer life in wood and light metal but doesn’t change what the bit can actually cut through. Cobalt bits are a different alloy entirely, harder and more heat-resistant, and they’re the ones you want for stainless steel, cast iron, or repeated use in hardened materials. If you’re drilling mostly wood and the occasional stud or bracket, titanium is enough and cobalt is wasted money. If you’re a metalworker or you’ve snapped bits trying to get through stainless, pay for cobalt.
Tip geometry is the second thing, and it’s underrated. A split-point tip (sometimes called a self-centering tip) starts cutting immediately instead of walking across the surface before it bites. On a drill press this doesn’t matter much. Handheld, especially on metal or tile, it’s the difference between a clean hole and a scarred-up starting point and a bent bit.
The case matters more than people expect because the actual failure mode of most bit sets isn’t that the bits wear out, it’s that half of them go missing within a year. A set with individual slots that hold each size snugly will survive garage life. A set in a flimsy blister pack or a case with loose, oversized slots will scatter sizes across your shop within a few projects.
Fractional vs. index sets
Dewalt sells both fractional sets (1/16″ to 3/8″ or similar, in standard jumps) and full index sets that go in 1/64″ increments. For most DIY and trade work, a fractional set covering the common sizes used for pilot holes, hinges, and hardware clearance is what you’ll actually reach for. Full index sets are for people doing precision work where a 1/64″ difference matters, like metalworking or jig-making. Buying a 115-piece index set when you really just need 1/8″, 3/16″, 1/4″, and 5/16″ repeatedly is money spent on bits that’ll sit unused.
Comparing the common Dewalt set types
| Set type | Best for | Typical range | Watch out for |
|---|---|---|---|
| Black oxide, basic | General wood, drywall, light-duty use | 1/16″ – 3/8″ | Dulls faster in metal, fine for occasional use |
| Titanium-coated | Wood, plastic, mild steel, mixed DIY | 1/16″ – 1/2″ | Coating wears off over time, core steel is still black oxide |
| Cobalt (M-35 or similar) | Stainless, cast iron, hardened metal | 1/16″ – 1/2″ | Costs 2-3x more, overkill if you never drill metal |
| Combo sets (bits + drivers + bits for masonry) | One-box solution for mixed projects | Varies widely | Often weaker on any single category than a dedicated set |
Combo kits vs. buying bits separately
Dewalt’s larger combo kits bundle drill bits with driver bits, sometimes masonry bits and hole saws. These are genuinely good value if you’re starting from nothing and want one case that covers 90% of what comes up around the house. The trade-off is that the drill bit portion of a 100-piece combo kit is usually thinner in actual sizes than a dedicated drill bit set at the same price. If you already own driver bits and just need the drilling half, you’re better off buying a dedicated Dewalt drill bit set rather than paying again for driver bits you don’t need.
If metal work is a regular part of what you do, skip the general combo kits entirely and look at a Dewalt cobalt drill bit set instead. For masonry and concrete anchors, drill bits in a wood or metal set won’t survive it, you want a dedicated Dewalt masonry drill bit set with carbide tips instead.
When the cheaper set is the right call
If you drill a dozen holes a year for picture frames, shelving, and the occasional furniture assembly, a basic titanium 14 or 21-piece set is genuinely fine. You don’t need cobalt steel for pine. The failure mode you’re actually avoiding at that price point isn’t performance, it’s losing bits and buying the same cheap set again next year, so the case quality matters more than the steel grade.
Where spending more pays off is frequency and material. If you’re putting a drill bit through steel brackets, hardware, or stainless fasteners more than a few times a month, cobalt bits will outlast two or three titanium sets and you’ll stop snapping tips on hardened screws.
Bottom line
Match the steel to the material you actually drill, not the material you might drill someday. Most people doing wood and occasional hardware are fine with a titanium set under $30. Metalworkers and anyone drilling stainless regularly should spend the extra for cobalt. And whichever you buy, check that the case has individual slots before you check the piece count, because a 70-piece set with a bad case turns into a 40-piece set within a year.
