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 drill bits for 3d printer nozzles, they work well. They are fragile drill bits in the sense of do NOT bend as you hand drill or use an electric drill. If you keep the drill bit straight they work perfect and are sharp.

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

I use these to drill through scrap that's wedged in a metal stamping die. It works great, they are 1/8 shank so they go perfectly into my rotary tools. They snap easily, because they are carbide and not meant for any slide loads. They are designed for a drill press or a rigid machine that keeps them vertical

Very Nice Set!

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.

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.

Super fragile - I will give them 3 stars because it was my fault for not noticing the list of materials these bits are suitable for in the description, I used them for thin brass sheet and even with a punch divot they easily snapped. "Jewelry" in the product name insinuates metal, and these are not suitable for most metalwork in my opinion. I was in a bind and needed bits quickly but couldn't find my usual on Amazon, definitely wouldn't buy again for a jewelry project.

High quality bits!! I use them to make model wood boats.

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.

The bits cut into printed circuit board well.

Sharp and strong

FIRST DAY....LOVED THESE FOR CAR MODELING but I BROKE 4 IN ONE DAY yOU SIMPLY CAN NOT PUT PRESSURE ON THEM iF YOU ARE DRILLING AND MEET A TOUGH SPOT...STOP..BACK U AND TRY AGAIN WITH VERY LIGHT PRESSURE ( LET THE DRIL TRY TO SLOWLY CUT THROUGH ...i'M ORDERING MORE LOL

Versatile. Can use in any drill.