Lothee 60 Pcs Shank Tungsten Carbide Micro Drill Bits Set, Tungsten Steel PCB Print Circuit Board Flute CNC Router Bits for Rough Stone Print Circuit Board Jewelry Engraving (0.1-1.0 mm)

Great bits but the smallest are extremely fragile. One of the three sets I received had the .1mm - .3mm snapped off in the unopened case because the bits weren't tightly bound by the cases built in bit holders. You'll want to inspect them closely when they arrive because the smallest bits are so tiny, it's difficult to even see them thru the case plastic

They're easy to break, but they do work with finesse! I bought these in an attempt to resize carburetor jets, and they worked wonders! The range in size is nice, and you get enough of all of them to break one and still be okay. Be careful with them, and they drill just fine.

The only reason I didn't give it 5 stars is because, if you're like me, I skip over 5-star reviews.First off, the number of drills you get for the price is a great value. The sizes are actually noticeably different and color coded, though I didn't actually measure them. They come in a pack of three cases that stand upright for easy access.I personally use them to make hole for my 15mm cannon barrels on my tanks and they work beautifully. Little force to start and very sharp. You can even use some of the thinner drills to use om M.G.'s if you have magnified lenses and a steady hand.I would state that the thinner ones are very brittle, so a soft touch is extremely important when using them, but if you've ever used drill buts this thin, you should already know that. So, the only drawback for me is that the shanks are quite thick and takes a little bit umph to get them in my pin vice, but they are also long enough to use them by hand.Hope this helps.

If you do any watch-making or repairs, these are cheap and great for enlarging wristwatch hands holes when they arrive and the Cannon Pinion holes aren't quite the size the mfr said they were. If you don't do watches, you could maybe start a successful 'side-hustle' doing stuff like Canine & feline dentistry?

Obviously for the tiny amount of material to make such precision modifications they are inherently delicate. But if you are tactful with your implementation, they are great. The bits are rather sharp. Aunt certainly sufficient for wood, plastic and softer metal. I use them enlarge some of the nozzles on the tip of GDI fuel injectors. I did break a couple bits figuring it out, but once I had everything stable it was smooth sailing

I'm really not sure what type of material these are supposed to be able to drill through. I'm using just a simple 925 18 gauge sheet and they just break. Part of the problem is the little rubber grout doesn't allow you to bury the drillbit into your drill enough to protect it. Extremely weak. Do not suggest.

I purchased this set for PCB prototyping and small-scale engraving projects, and I'm genuinely impressed with the performance. The range from 0.1 mm to 3.0 mm covers everything I need for intricate work on circuit boards, jewelry, and even some softer stones.The tungsten carbide construction is solid and feels very durable. Even after multiple uses, the bits stay sharp with minimal signs of wear. I've used them in a CNC router, and they cut cleanly without chipping or skipping, even on delicate materials.What I appreciate most is the consistency—each bit is clearly labeled and fits snugly in my collet without wobbling. The storage case is also a nice bonus for keeping everything organized and safe.If you're doing precision drilling, engraving, or micro-routing, this set is a fantastic value for the price. Highly recommended for makers, hobbyists, and anyone working with fine detail.

Very sharp, very useful for (in my case) clearing and enlarging holes in emulsion tubes.Since they are so tiny, I've found that, even though they have 1/8" (4mm) shanks, I don't have a chuck or collet that's precise enough to use them in power tools, but they're so sharp that I have no trouble turning them by hand.

So far this set of drill bits is turning out to be exactly what I was hoping for, awesome value for the money, would definitely by them again!?

excelente simplemente excelente

Not as pictured. But still I can make do I use these all the time