MACXCOIP 115-Piece Cobalt Drill Bit Set Review: a full-size kit for metal work on a budget

The MACXCOIP 115-piece cobalt drill bit set targets people who want a complete kit for metal work without paying premium-brand prices. On paper, it covers almost everything: fractional sizes from 1/16" to 1/2" in 1/64" steps, letter sizes A–Z, and numbered bits #1–#60. That’s the classic full index you see in more professional sets, usually at a higher price point. The average Amazon rating of about 4.4/5 suggests buyers are mostly satisfied, with a few mixed experiences.

The bits are advertised as M35 high-speed steel with 5% cobalt, plus a titanium aluminum nitride finish. In theory, that combination should give better heat resistance and wear resistance than basic HSS, which matters a lot when drilling stainless steel, hardened bolts, or cast iron. The brand also highlights a 135° split-point style tip and a standard jobber length design, both pretty typical for metal drilling.

In the published reviews, several buyers emphasize that the bits are quite sharp and cut easily through steel, including a case-hardened shock bolt in one example and a broken machine screw in another. Others focus more on value: the idea that one premium-brand cobalt bit can cost almost as much as this whole kit, making this set attractive even for a single job. There is at least one negative experience about early breakage on a first set, but that story also points to how the seller handles customer issues.

Overall, this looks like a set designed for people who want a wide range of sizes and the ability to work on metal, but who are willing to accept some uncertainty versus top-tier industrial brands. The big question is not whether it can drill metal at all—reviews say it can—but how consistent the quality is across 115 pieces and over time. That’s where the mix of praise and one-off complaints becomes important to read closely.

Several buyers explicitly highlight the value for money as one of the main reasons to choose this MACXCOIP set. One comment notes that a single cobalt bit from big brands like Dewalt, Milwaukee, or Bosch costs nearly as much as this entire 115-piece kit. That comparison is important: this product is clearly positioned as a budget or mid-range alternative that gives you a complete index at the cost of one or two premium-brand bits. For many users, especially DIYers, that trade-off is attractive.

One buyer even admits they bought the set for a single project, expecting a "one and done" use from the bit they needed. In the end, that bit worked well, stayed sharp, and appears ready for more work. From their point of view, the set already justified its cost with just one job. Another user says the set saved them about an hour of disassembly by allowing them to drill and back out a broken screw in a hard-to-reach spot. For those users, the up-front price is quickly offset by time saved and the convenience of having many sizes available.

However, lower price often comes with potential compromises. The one detailed negative story about early breakage and a replacement set shows that quality control might not be as consistent as top industrial brands. That said, the seller’s response—offering a refund or replacement and turning that review into a positive one—adds value through after-sales support. In other words, you might not get the same batch-to-batch reliability as with a premium brand, but you also are not left alone if something goes wrong.

In my opinion, the value is strong for occasional and moderate users. If you are a home mechanic, hobby fabricator, or general DIYer who wants the flexibility of a full cobalt index without spending heavily, this set makes sense. If you are a professional machinist or fabricator who drills hardened steel all day, investing in a more expensive, proven brand will likely pay off through longer life and fewer surprises. For its intended audience—people who need a big range of bits that can handle metal reasonably well—this MACXCOIP kit offers a solid price-to-capability ratio.

From a design standpoint, the strong point is the complete size coverage and standardized geometry. You get fractional, letter, and number sizes, which is exactly what you see in more professional drill indexes. For anyone working with machinery, fasteners, or tap-and-drill charts, that matters. Instead of guessing between 3/16" and 13/64", or not having a #7 for a tapped hole, this set tries to give you a bit for almost every chart line you might encounter.

The bits use a straight shank across the range, which is standard for jobber bits. The 135° point and twist design is meant for quicker penetration and better chip evacuation. MACXCOIP highlights the "self-centering" aspect; in practice, that usually translates to less walking on flat metal and fewer issues when starting holes, especially if combined with moderate pressure and the right speed. Several buyers mention that the bits cut into metal cleanly and that the sharpness out of the box seems good, at least on the units they received.

Another element of the design is the metal index storage box with size indexes. Reviews speak positively of the case, describing it as handy, organized, and strong enough for regular storage. The box appears to use labeled rows to separate fractional, letter, and number bits, which is far better than the flimsy plastic sleeves that come with some budget kits. When you have 115 pieces, good labeling is not a luxury; otherwise you waste time hunting for a #29 or a 5/32" every time.

That said, a full index set always has a weak point: small-diameter bits are fragile by nature. There is at least one report of multiple bits breaking with light use, though that customer later received a replacement set and reported that the new bits behaved much better. That kind of story suggests that the basic design is sound, but quality control may not be as tight as on high-end industrial brands. In my view, the overall design is practical and well thought out for workshop use, but you should still treat the smaller sizes gently and not expect miracles if you abuse them in a handheld drill on hardened steel.

With 115 individual bits, storage and organization are as important as the bits themselves. MACXCOIP supplies this set in a metal index storage box with size markings, which is a big step up from the thin plastic clamshells that often come with cheaper kits. The dimensions—roughly 15.35 x 6.3 x 4.33 inches and around 7.28 pounds—show that this is a substantial, toolbox-style case intended to live on a shelf, in a drawer, or in a vehicle, not in a small pouch.

The brand mentions that the case includes drill holders with size indexes, which typically means labeled rows for fractional, letter, and number bits. Buyers mention that the case is handy and keeps everything organized and easy to carry, which is essential when you need to find a specific # or letter size quickly. When you are working off a tap chart or matching a hole to a fastener, spending time hunting through unlabeled slots quickly becomes frustrating. Here, the organization appears to be one of the quieter but real strengths of the product.

Because the case is metal, it should handle normal shop conditions better than thin plastic, at least in theory. It will not be immune to dents if dropped, but it is less likely to crack or break a hinge. The weight of over 7 pounds also suggests that the hinges and latches need to be decent, since they are holding a fair amount of steel. There are no widespread complaints in the reviews about the box failing, which usually show up quickly when a case is poorly built.

In my opinion, the packaging is well adapted to a full index set. It is not compact, but that is the trade-off when you want 115 bits, all visible and labeled. For a workshop or garage, this style of case makes sense: you open the lid, pick the exact bit size you need, and put it back in the same place. For mobile professionals who need ultra-portability, it might feel bulky, but for bench use and organized storage, the packaging appears to do its job properly and contributes to the overall value of the set.

Durability is where the mix of spec sheet and user comments needs a bit of nuance. On the materials side, the bits are M35 cobalt HSS with a TiAlN finish. In theory, that is a recipe for good wear resistance and heat tolerance compared with basic HSS. Cobalt helps the cutting edge stay hard when hot, and TiAlN is known for improving surface hardness and reducing friction. This should translate into slower dulling and fewer burned tips if you don’t abuse the bits with excessive speed and no lubrication.

Among the Amazon comments, one verified buyer initially reported that they had several bits break after using the set only a couple of times. That is obviously worrying if seen in isolation. However, the same person later updated their review, explaining that the seller contacted them, offered either a refund or a replacement, and that the new set performed much better and "seems to be holding up great." They describe the original set as likely a fluke and are now satisfied with the durability of the replacement. This points to possible quality variation between batches, but also to a brand that is at least willing to correct problems.

Other buyers state that the bits remain sharp after specific jobs, like drilling through shock bolts or completing a project where the user expected a one-time use. For a budget-friendly full index, that’s encouraging. At the same time, small-diameter bits are always vulnerable to snapping, even in premium sets, if misaligned or pushed too hard. The comments do not show a widespread pattern of catastrophic wear or massive breakage; instead, they show mostly positive durability with one clear outlier that was resolved by customer service.

In my view, the durability is good for the price level but not bulletproof. If you use these in a controlled way—correct speed, some lubrication on tough metals, avoid side loading—they should last reasonably well for home and light workshop tasks. For daily professional abuse on hardened materials, higher-end brands with tighter quality control are still a safer bet. But for the typical DIYer or small shop that wants a full range of sizes and will not drill stainless all day long, the durability profile seems acceptable, especially considering that the seller appears willing to back the product when something goes wrong.

On paper, the M35 cobalt alloy plus TiAlN coating positions these bits a step above standard HSS or black-oxide sets. M35 typically includes about 5% cobalt, which improves red-hardness: the ability of the cutting edge to stay hard at higher temperatures. That matters when drilling into stainless steel, hardened bolts, or thick steel where heat builds up quickly. The 135° point angle also helps by reducing thrust force and starting the cut more effectively, especially when combined with a suitable feed rate and lubrication.

Public reviews give some concrete examples of how this translates in real jobs. One buyer reports drilling through a case-hardened shock bolt successfully, which usually requires a decent bit and reasonable technique. Another buyer used the set to back out a broken machine screw in a tight spot: by stepping up through several sizes, one bit finally caught the broken screw and spun it out, avoiding a long disassembly. These anecdotes suggest that, when used correctly, the bits have enough bite and toughness to handle moderate to demanding metal work.

Other comments describe the bits as sharp and efficient on wood, metal, and plastic. For occasional DIY use, several buyers say the performance already “paid for itself” by saving time on a single repair. One user who originally bought the set just for one project notes that the bit they needed stayed sharp after the job and appears ready for further use, which is a good sign for light to medium workloads. However, almost no one in the reviews is running these all day in a production environment, so there is limited feedback on heavy professional use.

In my opinion, this set should be viewed as a strong performer for occasional or moderate metal drilling, especially considering the price bracket. It is not pretending to replace high-end, brand-name cobalt sets in a machine shop running at full speed all week. But for home mechanics, DIY metal projects, and general repair work on cars or equipment, the geometry and alloy are well suited. The main caveat is technique: like any cobalt bit, these will last longer with correct speeds, lubrication, and avoiding side loads—things that budget buyers do not always follow perfectly.

On the spec sheet, the MACXCOIP cobalt drill bit set is a classic full index kit built around the M35 alloy. You get 115 bits in total, broken down into three standard series: 29 fractional bits from 1/16" to 1/2" in 1/64" increments, 26 letter sizes from A to Z, and 60 numbered bits from #1 to #60. For someone who does mechanical work, fabrication, or general repair, that range covers pilot holes, clearance holes, and fairly precise diameter choices without having to improvise.

The bits are described as HSS M35 jobber length. Jobber length means a normal, general-purpose length—not the short “stubby” style or the extra-long variants. This is the typical format for hand drills and drill presses in workshops. The cutting angle is listed as 135 degrees, which usually means a more aggressive, self-centering tip compared with the 118° tips found on many basic wood/metal bits. That sharper geometry should help reduce walking on metal surfaces and start holes more cleanly, especially if you don’t use a center punch every time.

MACXCOIP also advertises a titanium aluminum nitride (TiAlN) finish. In theory, this coating improves surface hardness and heat resistance, and it usually appears on bits meant for harder materials and higher-speed drilling. Combined with the cobalt alloy, the set is marketed for hardened steels, stainless, cast iron, copper, aluminum, plastics, and wood. Buyers in the comments confirm use on wood, plastic, and various metals, with several reports that the bits handled steel jobs correctly when used with care.

Physically, the entire package is not tiny: about 15.35 x 6.3 x 4.33 inches and around 7.28 pounds. So this is not a pocket organizer but more of a bench or toolbox piece. In my opinion, the positioning is clear: a full-size metal-oriented kit for people who want most common drill sizes at hand, and who might occasionally push into harder materials than what a cheap black-oxide set tolerates. It is not presented as a niche precision set, but as a broad, general-purpose metal kit leaning toward harder jobs.