50pcs PCB Drill Bits Set Spiral Flute Carbide 0.3mm-1.2mm for Print Circuit Board Stone Dremel Jewelry CNC Engraving (5PCS Each)

My immediate reaction was the drill bits looked well made and the individual boxes will provide good protection for the drill bits.I wasn't thrilled that the bits are not marked with the size. It was not difficult to make labels to affix to each bit and I have already done so. Doing it took some time but at least I won't have to measure a bit every time I want to use them. I used a digital micrometer to measure each bit.As far as their performance goes they work great. They are very sharp and I have already used them on three types of wood and bamboo, as well as plastic. The bits cut through everything with ease. I even had to drill some holes on sloped surfaces and if you start slowly the bits will not deflect. I think because they are tungsten carbide they are quite stiff and that helps on angled surfaces. However, I am sure most users know that since they are stiff and being quite small diameters you will have best results if used with a drill press. Drilling by hand can be done but the risks of breaking bits is greaterOverall I am very pleased and hopefully the bits will stay sharp over time.

It goes without saying, that when utilizing drill bits this small, they're very easy to break if you're not really, really cautious.Having a small, jewelers style drill press is quite beneficial and will save you a lot of time and frustration. The fact you receive such a large quantity is a real blessing and I'm very pleased with these bits.Yes, I would recommend them.

Works well for purpose intended, must be very carefully when drilling, breaks easily.

Bits work great!! Nice and strong and don’t snap easily like some others I’ve tried.

I am not easily impressed and never thought I'd be excited over micro drill bits, but these are phenomenal. I just returned 2 sets of micro drill that were not as advertised where they just threw in a bunch of a couple sizes yet were sold as a complete set. These are truly a set. I needed to drill a lot of holes under .020 in some N Scale track. My old set was missing the smallest sizes so I needed new. I started with the 3rd smallest in this set (.0185 in) and chucked it in my old floor model drill press. I drilled through 1/8 plywood first before testing it on a section of track. Both came out great. I then moved down to the 2nd smallest (.0150 in) and drilled another section of track. No glitches, no broken bits, just perfect holes as needed. I feel confident I can now complete the task once the temp in my workshop gets above freezing.

Good little bits, but you need to understand the sizes.

If you're looking at these, you probably know how to use them. I bought the multi pack set of these twist bits to have extras. They are delicate and prone to breaking (not a fault of the product). I use them primarily in my small engine shop for carburetor work. They work well for clearing blocked fuel and air passages.

Handy container, decent sharpness for wood model. good range od sizes for ship model construction