Irwin Industrial Tools Metal Index Drill Bit Set and Industrial Bolt Extractor Set

Hands down the worst quality drills I've ever owned, and I've been in the fabrication business for 40 years......I needed to cut a 1/4" hole in a hardened brake bracket on a drill press, and a 1/16 drill wouldn't even scratch it, then changed speeds slow, up to fast...nothing................used Brownell's DO-DRILL oil........nothing, barely polished tiny area around the punched area.I went and grabbed a set of cheapo QVC drills .... to see if I could ruin something inexpensive........went RIGHT THROUGH THE BRACKET like butter! ........The hole was .010 under size, so I used one of the Irwin drills to true up the whole size.......it just squeaked and rounded the bit off....Thankfully, I have an ACE Hardware close by. and went over and bought a $6.96 cobalt bit.......went through like butter.After 40 years, these are without a doubt the worst Chinese junk drill bits I've ever bought.......................they'll cut wood and aluminum fine, but they lose their edge and fight to cut mild steel...............................trash.Sorry Irwin, but you turned a 20 minute project into a ruined afternoon.. You guys should be ashamed marketing trash like this.Now I just need to figure out how to return them

I have been fabricating stainless steel railing posts and decided to invest in a really good set of cobalt bits. After drilling 100 1/8 inch pilot holes with a single Amoolo bit (separately reviewed), 60 3/16 holes and 20 1/4 inch holes, each with only one non-Irwin drill bit, I tried the Irwin bits. Using the same speed and lubrication as my prior 180 holes, one Irwin bit drilled 4 holes, and one managed 3 before they were ruined. I can't return them as they are not in "new or like new" condition. I now have a $92 drill organizer. I am sick about this purchase. I can't stress this enough: DON'T BUY THESE BITS. THEY ARE JUNK.

I'm not one to normally write reviews, but this product worked so well I had to do it. I had a starter bolt snapped off in the cast iron block (Chevy) of my Sea Ray Boat. I tried heating the block and grabbing the bolt with a pick to spin it around, that went nowhere. I have previously drilled and extracted bolts with regular bits, and knew this job would be a challenge. So I decided to try using some left hand bits. Well, it went superbly. I started with the medium size bit in this set (smallest that would fit in my 1/2" drill.) I used a center punch (engine block hanging off a cherry picker, BTW, no easy 90 degree reference.) That drill bit went right through the hardened starter bolt with ease, bit didn't bend or walk at all. Using s slow drill speed, it just chewed out two continual pieces of swarf until I got to what I though was the end of the bolt. I put in the next size bit, it grabbed a hold of the bolt and screwed it right out. No problems at all, it took me longer to pull my extension cord out than it did to do what I thought was going to be a nightmare job.

Excellent drill bit set for the money. I'm very pleased and have already used them on several tough projects. I always clean after each use with a slightly oiled rag and also like to use a pre-drill technique by using smaller bits and slowly graduating to my final bit size; typically, when drilling into extremely hard surface materials and substrates. I also use lubricating oil to minimize heat build-up/friction, and avoid unnecessary wear. Yeah, they're "cobalt" but that that doesn't mean they can't be destroyed in relatively quick fashion if you don't use common sense for various applications. Lubricated bits last longer. For drilling holes in steel that's 1/8 in. or thicker, use cutting fluid or a multipurpose oil like 3-IN-ONE. Lubricating the bit reduces friction and heat buildup, which makes drilling easier and your bits last longer. Cheers!

I got tired of other drill bits barely drilling into steel and then breaking. Spent some money and it was so worth it.Pros:Cut like butter, maybe too well on mild steelIn the drill press these work amazing, nice clean cuts.Cons:Without a hex/flatted shank these bite and dig quickly so in a battery powered hand chuck drill the bit ends up catching and the drill keeps spinning around because it can't hold the bit still. These are so sharp and durable though you can step back and nibble it away with some care.

Bought the 5 reverse bits along with Irwin E-Z outs and spring loaded center punch in the frequently bought together feature.The bits impressed me right off as I've never seen a drill bit pull ribbons of metal out of a grade 5 bolt like it was aluminum. A pilot hole and then the correct size for the e-z out. A couple taps and was able to unscrew the broken muffler bolt put of my snowblower. Took me longer to find my Kroil to soak for a couple hours than it took to get the bolt out. Nice kit that worked perfect. Great not to have to load up equipment to take to the small engine repair shop.You don't use it often, but good to know you bought a quality set-up.

Nothing is worse than snapping a bolt off, no matter what situation you're in. Bolt extractors work occasionally, but more often than not, they make the problem even worse! Fortunately, left handed drill bits are less prone to breaking and do a fair job of removing stuck bolts! These Irwin left handed drill bits are good and sharp, and they are good quality as well! They have already saved my butt a couple of times, ultimately making for a good day when leaving the shop!Highly recommend using these bits if you're a mechanic. Great to have in the 'Emergency Use Only' tool kit!

Good quality

I purchased these cobalt bits based on reviews, and had a hardened steel plate to drill. Already have tons of high end bits but wanted to splurge , the extra cost of these bits are not worth it at all, broke to bits immediately on a press drill, and even the ones that did not break , did not even penetrate the steel, very disappointed and I would not buy these again, I can’t understand how the reviews quoted them so good, and yes I know about but lubricant and drill bit speed. Wish I could get my money back and buy 3 sets of regular bits...do not recommend

I bought these drills to drill out a broken screw driver bit. They didn't perform any better than a cheap drill bit. Maybe these are cheap drill bits but cost a little more. I'm not sure where they are made, I was hoping for a USA product. They had a hard time biting into a screw fastening a windshield frame (with cutting oil), so I'm back to finding a real drill bit. Waste of time with this product, very disappointed.

I purchased these bits primarily to drill a hole thru a 1/2 In steel shaft. The first bit snapped off at the end shortly after I started drilling. The second bit eventually drilled down about 1/8 in before dulling off and just turning in the hole. They are supposed to be good for hardened steel but are only marginally better then a cheap bit that I tried initially.

Just buy cobalt bits don’t waste your money on anything else these will drill everything I’ve put them on including stainless