Which of these bits for carbon fiber and fiber glass?

[GEOFFREY]

The helix cutters need to have a sharpened edges at the bottom and are usually referred to as end mills. If you want to try one, PM me your address and I will send you one. G.

[Tenson]

I've used these for cutting PCBs to size. Gave a very clean finish. However I've been told that carbon fibre leaves luch more fine abrasive dust than glass fibre. In that case the tool apparently wear very fast and a burr type is better.

5x 1/8'' Carbide CNC Double/Two Flute Spiral Bits 12mm | eBay

[Philly]

Slightly on topic, where can you buy the sheet FR4 or similar fibreglass?