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Ideal for drilling in tough metal, including heavy-duty abrasive alloy metal drilling on hardened steel. Made from industrial grade High-speed steel for increased durability. 8% Cobalt Alloy Steel alloy is heat and abrasion-resistant. 135-degree split-point tip starts drilling immediately with less force and eliminates "walking" across the work surface. Metal index case for easy bit access and identification. Includes drill bit sizes 1/16- to 1/2-inch in 1/64-inch increments. IRWIN Tools Cobalt Alloy Steel High-Speed Steel Drill Bit, 29-Piece Metal Index Set (3018002).
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The Irwin 29-Piece Cobalt M-35 Metal Index Drill Bit Set includes drill bit sizes measuring from 1/16 to 1/2-inch in 1/64 inch increments. The 29 bits are made using heavy duty web construction for strength and durability, and the cobalt steel extends the life of cutting edges. The 135-degree split point tips start drilling on contact and cut with less force. A reduced shank above the 3/8-inch point lets you use larger drill bit in a 3/8-inch chuck, and you can select the right bit using a convenient tap and drill selection chart. The set's rubber overmolded case protects against damage from accidental dropping, and you can remove cartridges to easily carry bits from the case to your worksite.
Jack Williamson
Reviewed in the United States on March 13, 2025
Works great
stephen s.
Reviewed in the United States on January 15, 2025
Highly recommend for hardened steel
Allan R
Reviewed in Canada on September 2, 2024
Love this set top quality drills . The set is in a great case , tough and ready to go . These drills with cutting fluid will go through any steel .
daniel zuidema
Reviewed in the United States on June 10, 2024
This was my first set of higher quality drill bits & they have worked amazingly well so far. After years of cheap sets that go dull after 1-2 uses these have been a game changer. They stay sharp & cut into steel very well. Have used the set to drill out bolts that I would have never even attempted in the past. I'm sure there are higher quality sets out there for big money but for the price these do very very well. Highly recommend
David Irwin
Reviewed in Canada on May 13, 2024
Great service & worked Great
Jimmy C. Dowers
Reviewed in the United States on March 25, 2024
The bits are very good, very sharp. The case is terrible. Hard to open, hard to close. The top does not match the bottom. I would buy again only for the bits. I am looking for a good case. This one should be replaced by a good one. Someone in quality control is not doing their job.
handfree
Reviewed in the United States on November 21, 2024
i use these all the time they hold up well , i have bought several through the years and always good quality they work perfect on hard steel ,i would never buy cheap bits again ,well worth the money
Lance
Reviewed in Canada on May 7, 2021
Well packaged, sharp drill bits excellent for drilling hardened and stainless steel. Remember to use lots of cutting oil to prevent them from dulling. I'll never go back to other brands.
Aleks
Reviewed in Canada on January 6, 2020
Used 4 sizes, including the smallest and the largest and so far, they are cutting through thick metal like butter. I remember such drill bits when I was young, before the markets got saturated with cheap bits that don't last or don't even do the job. These are remarkably well made and are worth the money. Just remember to use oil to cool them while drilling.
Elian L Ramos
Reviewed in Mexico on July 25, 2017
Las brocas tienen una presentación muy buena, incluso mejor que brocas de marcas como URREA y aún precio menor.Ventajas: Buena presentación| Un buen precio| Perfecta para usos de un taller donde no se les dé un uso muy rudo o entusiastas de la herramientaDesventajas: No lograron entrar en una pieza de acero endurecido, solo entraron al aplicar líquido para barrenar de la marca TAP| El juego completo es pesado e incómodo para un transporte casual
Christian M.
Reviewed in the United States on February 25, 2017
Great set and these drill bits are the best I've used (baring specialty bits that are as much as this whole set). We were recently drilling through some thick metal to attach some new wooden slats to a cart and I was using one of these bits to drill with. After about 40 holes (with no cutting oil mind you) and not taking much of a break between, I did finally break one. We needed to drill roughly 50 holes. Went to the hardware store and they didn't have any of these in stock, just the lower grade ones. Titanium or something, I don't' remember. Anyway, broke 5 bits in the last 10 holes. Basically, these are way better than the alternatives.The reason for 4 stars it that the case is kind of terrible. The smallest drill bit constantly falls out and the whole thing is soooooo chintzy. It has that feel like the execs were sitting around and said "How can we make it SEEM like it's high quality and still make it as cheap as possible?"Barring the lousy case, you'd be hard pressed to find a better set of bits for this low a price. I can't recommend it enough.
Scott
Reviewed in the United States on October 14, 2015
Drill bits have always been like fingernail clippers for me....no matter how many I buy, I can never find one when I need it. I got tired of buying cheap, "throw away" drill bit sets that made more frustration than holes. I figured it was time to buy a nice set of drill bits so I picked up this Irwin set.This is a very nice cobalt set with a large assortment of sizes. Sure, you're paying a premium for them, but if you use them as intended, they'll last you years in a DIY environment. I've had mine almost 5 years and haven't broken a single one.I'm not a professional machinist, but I know enough to realize that even though these are "High-speed" drill bits, that doesn't mean you go full throttle when drilling holes. Take your time, slow down the RPMs, use a little bit of cutting oil and these babies will cut through anything and you'll still have a nice, sharp bit when you're done.Very impressed with this set and I would buy again.
noonesbusiness
Reviewed in the United States on June 6, 2013
I make no pretense to being a professional machinist, et cetera. In truth, pre-MBA, I was a scientist via mathematics. So, if your metric for relevance is related-professional-experience, give my review a skip. Indeed, I spent four years at a posh, New England prep-school, so, I even missed learning experiences such as "shop classes," ... among other things.Prior to these Irwin cobalt bits, I was of the, "crank up the (rotational) speed and hope for the best," school of metal drilling. Stupid. Watching (literally) these bits work provided a priceless, hands-on lesson in applied physics and physical metallurgy. Slow the rotational speed down (W-A-Y down), judiciously increase pressure (id est, PSI-loading), and watch ever longer spirals emanate from your successive drillings. Conversely, crank up the rotational speed, cook the bits, and complain about poor Chinese product molecular composition, drill bit fabrication, or, for something utterly inane, the packaging. I "cooked" the Irwin cobalt 1/4-inch bit and split the 3/8-inch. Fortunately, those two were the extent of my tuition costs.Despite the "handicaps" enumerated in the first paragraph, over the last twenty-five years, I have built eighteen proper -- with foundations and electrified (as in, "electrons," thank you) -- buildings, worked on heavy equipment (through 40-ton 'dozer), and burnt "miles" of welds. So, while I'm not "professionally" credentialed in the machining/building trades, I had been sought out to "fix" mechanical/"mechanical" problems of many folk who were. I was far from an utter rookie when the Irwin cobalts arrived; I am sure glad that they did. I'll buy more if and as needed.
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