Best Cobalt M35 Drill Bit Sets
Quick answer
For most buyers, the Sinyeenglon 99 piece M35 cobalt set is the top pick because it pairs the widest practical piece count and case organization with a broad 1/16" to 3/8" fractional range.
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Research updated September 2026.
What Matters Most for This Category
The most important factor in a cobalt M35 set is matching the size range to the work you actually do. Fractional only sets are fine for general metalworking, but projects involving tapping or precision machining benefit from sets that add letter (A to Z) and number (#1 to #60) sizes. Piece count matters less than it looks, since many large sets repeat common diameters, so weigh the true size range and the material grade against the price per usable size rather than the total count alone.
| Model | Best for | Key specs | Research Score |
|---|---|---|---|
| Sinyeenglon Cobalt Drill Bits Set for Hardened Metal and Stainless Steel, 99Pcs M35 High Speed Steel Twist Jobber Drill Bits 1/16"-3/8", with Plastic Index Storage Case | Best Overall | Sinyeenglon, N/A | 90/100 |
| StratMet 13pcs Cobalt Drill Bit Set (1/16"-1/4") M35 HSS Jobber Length | Best Budget | StratMet, $8.69 | 88/100 |
| MACXCOIP 13Pcs(1/16"-1/4") Cobalt Drill Bit Set M35 HSS Jobber Length | Best Value | MACXCOIP, $8.98 | 86/100 |
| Crosstar M35 Cobalt Drill Bit Set,Three-Flute Design,1/16"-1/2",21pcs | Best for Hardened Metal | Crosstar, $45.99 | 83/100 |
| MACXCOIP 29Pcs(1/16"-1/2") Cobalt Drill Bit Set M35 HSS Jobber Length | Best Expanded Set | MACXCOIP, $52.18 | 81/100 |
| Cobalt Drill Bit Set - 115Pcs M35 HSS Bits, 1/16"-1/2", A-Z, #1-#60 | Best for Comprehensive Sizing | N/A, $137.97 | 78/100 |
| IRWIN Drill Bit Set, M35 Cobalt Alloy Steel Steel, 29-Piece (3018002) | Best Premium Brand | IRWIN, $155.99 | 75/100 |
Sinyeenglon Cobalt Drill Bits Set for Hardened Metal and Stainless Steel, 99Pcs M35 High Speed Steel Twist Jobber Drill Bits 1/16"-3/8", with Plastic Index Storage Case
Best OverallPros
- Largest bit count in this roundup (99 pieces) covering a wide fractional range from 1/16" to 3/8"
- M35 cobalt construction designed to handle hardened metal and stainless steel
- Includes a plastic index storage case that keeps every size organized and easy to grab
Cons
- With so many sizes bundled in, some buyers may not need every bit included
- Jobber length bits are shorter than aircraft length, which can limit reach in deeper holes
This 99 piece M35 cobalt set from Sinyeenglon spans 1/16" to 3/8" and is built for cutting through hardened metal and stainless steel. Each bit ships organized in a labeled plastic index case, making it easy to keep the full range on hand for varied shop jobs.
StratMet 13pcs Cobalt Drill Bit Set (1/16"-1/4") M35 HSS Jobber Length
Best BudgetPros
- Lowest price point in this lineup, making it an easy low risk entry into cobalt bits
- Covers the most commonly used sizes from 1/16" to 1/4" for everyday drilling tasks
- M35 HSS jobber length construction suited for general metalworking
Cons
- Limited size range means it will not cover larger diameter holes
- Only 13 pieces, so duplicate sizes or backups are not included
The StratMet 13 piece set delivers M35 cobalt jobber length bits across the 1/16" to 1/4" range at a budget friendly price. It is aimed at users who need core sizes for routine metal drilling without a large investment.
MACXCOIP 13Pcs(1/16"-1/4") Cobalt Drill Bit Set M35 HSS Jobber Length
Best ValuePros
- Nearly identical price to the cheapest option while offering the same practical size range
- M35 HSS jobber length bits suited for stainless steel and other hard materials
- Compact 13 piece count keeps the set easy to store and transport
Cons
- Same 1/16" to 1/4" ceiling limits use for larger drilling jobs
- No storage case details are provided, so organization may depend on the buyer
MACXCOIP's 13 piece cobalt set covers 1/16" to 1/4" in M35 HSS jobber length, giving buyers a close alternative to other budget sets in the same size range. It targets shoppers who want dependable hard metal drilling capability at a low cost.
Crosstar M35 Cobalt Drill Bit Set,Three-Flute Design,1/16"-1/2",21pcs
Best for Hardened MetalPros
- Three flute tip design intended to improve centering and reduce walking on hard surfaces
- Wider size range up to 1/2" extends usability into larger hole diameters
- M35 cobalt build supports repeated use on tougher metals
Cons
- Mid range price puts it above the budget 13 piece sets without matching the largest sets' piece count
- Three flute geometry is a less common design, so replacement bits may be harder to source individually
Crosstar's 21 piece set uses a three flute M35 cobalt design meant to bite into hardened metal more predictably, spanning 1/16" to 1/2". The wider size range makes it suited for jobs that go beyond the smaller quarter inch sets.
MACXCOIP 29Pcs(1/16"-1/2") Cobalt Drill Bit Set M35 HSS Jobber Length
Best Expanded SetPros
- 29 pieces covering 1/16" to 1/2" offers more size increments than the smaller MACXCOIP set
- M35 HSS jobber length construction consistent with the brand's smaller kits
- Wider range reduces the need to buy separate sets for bigger holes
Cons
- Priced well above the brand's 13 piece set for the added size coverage
- Jobber length still limits depth compared to longer bit styles
This 29 piece MACXCOIP set extends the brand's cobalt lineup up to 1/2" while keeping the same M35 HSS jobber length build. It suits buyers who liked the smaller MACXCOIP set but need a broader range of sizes.
Cobalt Drill Bit Set - 115Pcs M35 HSS Bits, 1/16"-1/2", A-Z, #1-#60
Best for Comprehensive SizingPros
- Extensive 115 piece count covering fractional, letter (A-Z), and number (#1-#60) sizes in one set
- M35 HSS construction usable across 1/16" to 1/2" for varied drilling needs
- Consolidates multiple sizing systems into a single case, useful for machining or tapping work
Cons
- Higher price reflects the piece count, which is more than many buyers will use regularly
- Larger set size means more bits to track, organize, and eventually replace
This 115 piece M35 cobalt set combines fractional sizes from 1/16" to 1/2" with full letter and number gauge bits, covering nearly every standard drilling need in one case. It is built for users who regularly encounter varied sizing requirements across projects.
IRWIN Drill Bit Set, M35 Cobalt Alloy Steel Steel, 29-Piece (3018002)
Best Premium BrandPros
- Backed by IRWIN, a well established name in drilling and cutting tools
- 29 piece M35 cobalt alloy steel construction for hardened metal drilling
- Model numbered set (3018002) suggests consistent manufacturing and quality control
Cons
- Highest price in this roundup relative to its piece count
- Fewer pieces than the 99 piece and 115 piece sets despite the higher cost
The IRWIN 3018002 set offers 29 pieces of M35 cobalt alloy steel bits from a recognized tool brand. It targets buyers who prioritize brand reliability and consistency over maximizing piece count per dollar.
Who Should Avoid the Top Pick
Buyers who only need one or two specific bit diameters should avoid the larger 99 piece, 115 piece, or 29 piece sets, since they pay for sizes they will rarely touch. Anyone drilling unusually deep holes should also look past jobber length sets entirely, since all the sets here use jobber length rather than longer aircraft style bits. Extremely budget conscious buyers should be cautious with the higher priced 115 piece and IRWIN sets unless the extra sizing systems or brand assurance are actually needed.
Before You Buy
Before buying, confirm the exact size range you need, whether that is fractional inches, letter sizes, or number gauges, since not every set covers all three. Check that the listed M35 cobalt grade matches the material you plan to drill, such as stainless steel or hardened metal, and consider whether a storage case matters for keeping bits organized in a shop or toolbox.
FAQs
Which cobalt m35 drill bit sets are best for cobalt drill bit sets m35?
The Sinyeenglon 99 piece set stands out for overall size range and organization, the StratMet and MACXCOIP 13 piece sets are the best low cost options for common sizes, the 115 piece set is best when you need letter and number gauges in addition to fractional sizes, and the IRWIN set suits buyers who prioritize a recognized brand.
How do I choose cobalt m35 drill bit sets?
Start by identifying the material you drill most often and the exact size range you need, since M35 cobalt sets vary from basic fractional ranges up to combined fractional, letter, and number gauge sets. Then weigh piece count and price together, since a larger set is only worth it if you will use the extra sizes, and check whether a storage case matters for your workspace.
Our verdict
Across this lineup, the choice comes down to how much size range and piece count you actually need versus how much you want to spend. The Sinyeenglon 99 piece set offers the strongest all around balance of range and organization, while the StratMet and MACXCOIP 13 piece sets are reasonable low cost entries for basic jobs, and the 115 piece and IRWIN sets serve buyers who need comprehensive sizing or brand reassurance and are willing to pay more for it.