uxcell PCB Drill Bits 0.9mm Tungsten Carbide Rotary Tool Jewelry CNC Engraving Print Circuit Board Micro Drill Bits 1/8 Inch Shank 10 Pcs

Knowing the reputation that the Chinese have for dumping their junk on Amazon, I was very leery of buying these bits. However, since I was going to use the bits in a hand-held mini drill to drill solder out of circuit board holes, I figured that the bits would stand up to the minimal pressure and torque that I would be applying. I couldn't have been more wrong. In my attempts to drill the solder out of four holes, three of the 10 bits snapped off. I threw the raining seven in the trash.

These bits will do the job that I bought them for. I will probably have to get some a bit larger but, for the circuit boards I have planned these will do the IC's qute well. I made some test holes and they worked fine even though I am using an old hand drill to drill the holes. I would recommend these to any circuit experimenter.

Very sharp and strong. Love these!

Broke 10 bits on one job running slowest feed rate possible.