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 (0.1-3.0 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.

Nice micro drill set. The more bits the better because they tend to break. There isnt anything they can do to prevent this because they're very small. Better to use a pin vice. They work great for model building.

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.

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

extremely fragile and break easily

Worked great for me. I needed to drill a small hole in a tool that was too hard for HSS drills and one of these cut the material with no problem.

I’ve never seen something so faulty in my life. Worst product I’ve ever purchased. I’ve been using drillbits for a long time for jewelry and they snapped like crazy. If I could give it a zero star, I would.

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