NEIKO 04204A Hex-Head Multispline Screw and Bolt Extractor Set, Easy-Out Screw Extraction, Broken Bolt Remover, Stripped Fastener Tool, 1/8 Inch to 7/8 Inch in 1/32-Inch Increments, CrMo, 25 Pieces

Life saver. Don’t know how long the drill bits will last but the extractor bits seem pretty good. I was able to remove a bolt that was broken off, and one that the head was stripped and I already tried slotting with a cut off wheel. Both on a 2009 Yamaha YFZ450R.*** HAMMER THE EXTRACTOR BIT IN, and hand crank with a crescent wrench or something similar.I also use this brand for bits and they are great.

So pleased - a month trying to get this stripped bolt off and I was running low on transmission fluid! I don’t write many reviews but hoping this helps the next person.Ok so I had a very badly stripped differential fill Allen plug. Standard plug on a Land Rober SUV. This was semi stripped by prior mechanic and I just made it worse without the right tools. Tried the cold chisel method (you can see from photos I whacked the s&@t out of it and no luck. Bought the other stripped allen key versions on Amazon (the ones that have a slight twist in a standard looking hex/Allen to provide grip) and they just won’t get enough grip (not even close in my case so a big waste of time) if you were as badly stripped out as I was. No chance at all. I was really thinking I would need to learn to weld and go buy a welder to attach another bolt on which was going to be my last resort…Tried this and worked extremely well (was done in 20 minutes) with the following comments:As you can see from the photo I used the 11/32 size which fit about a third of the way into the stripped hex differential plug loose. I tap tapped it in gently with a 3 lb hammer to get it about 2/3 of the way in. You don’t need to be poinding it in hard since these have a slight taper which makes them slightly larger as they go further in. As you can see after massively torquing it at the end while successfully remove the fill plug it was ultimately seated about. 90% down. With the large 15mm sized head you know have a solid place to add a socket with a breaker or heavy duty impact.Other comments - IMO very little chance of this snapping off as I see others concerned about - I can’t attest to the quality of the metal but the size I was able to use makes it less likely it would snap. If I were to use the smallest 5-6 (9/32 or less) of the extractors provided I would be more concerned about putting a long breaker bar but at this size no issues. I ended up having to put a 15mm socket on a two foot breaker bar / pipe to get this to finally come loose. And once it did it was literally just finger screwing the rest of it off. Amazing how a seized bolt will hold until it doesn’t. I tried my 3/8 inch (air) impact gun before the breaker bar which is a low clearance since I didn’t have a ton of space. It’s like 350 foot pounds of torque so a mid range impact and it didn’t budge this differential plug although it MAY have weakened it up a bit so my breaker bar worked easier.Best of luck of luck to those reading this but this is the best of 3-4 methods I used and wish I started here since it was easy.Last bit of advice don’t underestimate how much torque you need to get one of these seized plugs off! And if you are in a tight area and able to use one of the provided extractors with some reasonable girth a long breaker bar is the way to go…

I would rate this 4 stars out of 5 because they surprised me a time or two for both good and bad reasons. The extractors do not seem to be worth anything good. They break easily. The drill bits, however, as long as you use the right ones for the application and with care, they work decently before they dull. I have yet to try and sharpen them and try again, but if I'm needing them, I typically don't have a way to sharpen them efficiently when I'm working. I'd have to run home or get a sharpener for when I'm working (I work on the road as a mobile mechanic). Of course, the smaller ones are more fragile and I get impatient, so they broke. But for small jobs at home, I'd buy them again. For the rest of my work, I'll be searching for a better quality set.

Great kit for the price. Withstood a pounding from my 1/2in impact and dug in to a very rounded allen bolt. As long as you’re patient these work phenomenally. Now the only trouble is to separate the hardware from the extractor.

Terrible experience with first use. Tried multiple drill bits with no luck. Hardly put a scratch on the bolt. (I’m not stupid. I know how a LH drill bits works.) Had to use a bit from another set. But then I broke off the extractor with minimum force. Poor quality. Complete opposite of helpful. I tried to save money by buying this set and it cost me more time, money and effort in the long run.

Dulled pretty quickly. Even when used at low speed with light pressure on soft steel. But that's what you get at this price point

So far they are GREAT. I only used them once to get rusted brake bleeder bolts out. Easy use and lasted 4 bolts without any deformation of the teeth

Did the job. Used on Hemi exhaust bolt, easy just have several extra bits