NEIKO 10038A Left-Hand Drill-Bit Set, High-Speed Steel Drills with Titanium Nitride Coating, Reverse-Twist Drill Bits, SAE Sizes, 13-Piece Set

Broke an M6 bolt off in the block over torquing water inlet for the thermostat housing. Used this to back it out - only needed the reverse drill bit. The joy of seeing the bolt back out was indescribable, lol.

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…

Be careful opening the case. The lid was so tight, when it finally gave way, the bits went flying everywhere. The quality of the bits seemed fair enough, but I broke the first one I used trying to extract a busted bolt on a hot agitator. The steel bolt had become hardened from excessive heat and the bit wasn’t even making a mark before it snapped. I ended up replacing the whole part. I grabbed a piece of 1/4 inch steel stock and drilled a couple holes through it without any trouble just to see if the bits could do it. Take your time and use cutting oil when drilling on metals.

Had some wrecked screws. The extractor set came in and within 15min, the problem was resolved. Easy, peasy. Used the grabbing socket, like budda! Would recommend! Salute

Poor quality deserved to be returned. I bought it to drill a hole in a broken screw, I bought it based on it is toughest. But it failed to live up with expectations, I closely monitored the temperature, and it broke within mins of use. I will still try to return, you can decline but you deserved to be returned with this quality

For the price they were good. Only used a couple of them but good to have.

Not magnificent. Cheap lefthand drillbit? Yep. Effective? Not very. Broke at least 1 bit. Typical chinese stuff, not for particularly tough jobs, the price says it all.

I got my hands on the Screw-Extractor and Left-Hand Drill-Bit Set, and it's been an absolute game-changer for my automotive repair work. The set's durability and performance have been nothing short of impressive, and it's a clear winner compared to the name-brand extractors available at major retail stores. The best part? It comes at a fraction of the cost. Using it to extract bolts from vehicles has been a breeze, thanks to the effective left-hand drill bits and screw extractor. It grips onto stubborn bolts firmly, making removal a quick and efficient process without causing any damage to the surrounding components. The affordability of this set is what initially caught my eye, and after putting it to the test, I can confidently say it's worth every penny and more. The quality of the materials used is top-notch, and even with frequent use, I haven't encountered any signs of wear or breakage. In the unlikely event that something does go wrong, I wouldn't hesitate to buy another set. This product has earned a permanent place in my toolbox, and I highly recommend it to anyone in need of a reliable and cost-effective bolt extraction solution.