Yosoo 10 pcs PCB Printed Circuit Board Carbide, Mini Micro Drill Bit, Drilling Set, 0.3 mm to 1.2 mm for CNC PCB, yosoo-225bit

These pindrills are brilliant. They used to be called pindrills for drilling component holes in pcb’s etc. cleaning out carburettor jets & a plethora of other uses.

Does what it’s suppose to

Drilled an orifice for a gas burner through brass annular, and broke the bit due to MINOR flexing. Be aware these are precision parts and will require a solid target fixture and delivery fixture, or they will break. I am not displeased, only by experience made aware of the precision fixturing required to do the work without destroying the bit, I have broken all of them during their first use and am pretty adept at mechanical engineering.

Wonderful for cleaning the carburettor but because of the size is very delicate.

easy to use on clearing small holes jets in carbs

A really nice set of precision drills , looking forward to using them

These are designed for drilling printed circuit boards, so bear that in mind when reading this.i bought these for clearing the tiny jets on lawn mower carbs. The smallest jet has a tiny, 0.03mm, hole which is a very common failing point.If these drills are used VERY gently & carefully, it's possible to clean the jet out with them. However, if you are the tiniest bit heavy handed, they will snap off in the hole & potentially junk your carb completely.Clearly, this applies to the very smallest drill bits & the others should be a little more robust.I've seen other sets for sale where there are multiple units of each size, which suggests that the bits aren't expected to last very long. If they snap off on a PCB, it's just an inconvenience, but I wouldn't recommend buying them for cleaning out jets.It is possible, should you fail to heed my advice, to use a small self-tapping screw to extract the jet. This give you a chance of recovery, albeit no guarantee!

if you have a dremel it is very useful