I have a large selection of PCB drill bits. size ranging from .25-6.8mm. These came from a PCB prototype company. I have literally thousands of drill bits. Most are made by Union Tool, some by Mega Tool and Tycom as well. Too many different sizes to list. These are carbide bits. These would be great for making your own PCB's, use with CNC drill/ Router machine. They have very high tolerances. Virtually all are Brand New. Asking $1 per bit plus shipping, That is less than 1/10 the cost new. Email me for the size(s) you would like.