uxcell PCB Drill Bits 1mm Tungsten Carbide Rotary Tool Jewelry CNC Engraving Print Circuit Board Micro Drill Bits 1/8 Inch Shank 10 Pcs

I use these bits in the 1.0mm size to open up predrilled holes on freshwater pearls. I've tried many different bits with a micro rotary tool, and most took a long time to drill, heating up the pearl and causing internal scorching. These bits are much sharper and drill 10x faster, and hold on much tighter. My only complaint is that some seem to be created with more fragility. I've had 2 break mid shaft in a row after 1 or 2 uses only to have a 3rd last well over 20 drills before snapping. But the ability to drill cleanly, quickly, and precisely is why I will keep buying these, despite the problem with breaking.

Very sharp--make very clean holes in 1/4" pine. Using a Moto Tool drill press and have no breakage--over 200 holes so far.

I blew through ten in ten minutes. Used them properly--water cooling, high speed drill, careful to keep them straight. They tend to shear inside the hole, often ruining the workpiece.

These work great with a high speed drill. I use a Proxxon bench drill running at 8500 rpm, works fine for drilling pcb boards.You will not be able to use this product successfully at low speeds, and with a hand held drill you will probably snap the drill bit when you have drilled a hole and are extracting the bit out of the hole. Been there, done that.

Inexpensive bits 0.8mm which although useable are very fragile. They appear to be more useful for light engraving like printed circuit board etching than any kind of "milling".Feed speeds need to be kept below 200mm/ min.On PCBs, 0.6 mm are only useful for drilling

Was not expecting much out of these bits considering the price point. Even with that said I broke 5 trying to complete my project which was surprising. Adjusted the depth of cut feed rate and spindle speed to overcome the breakage however theses are just very fragile. I admit I am new to CNC however I have used other 1/32" bits that were about twice the price of these without breakage.I can not recommend these bits.

reasonable performance cutting hard wood on my CnC machine

Great quality. Use on copper laminated fiberglass printed circuit boards. No issues. Makes the drilling job quick.

Versatile. Can use in any drill.

Arrived quickly. Used to drill holes in a fairly small pc board, 4" by 3". Not that many holes. I mounted the bits in a drill stand and used 2 bits to drill all the holes. The first bit broke half way thru the process. This could have ben my fault.. The bit seemed to be still sharp at the end of the job.