Review on Champion Cutting Tool 705C Pack of 12 by Jeffrey Sanders

These are pretty good quality drill bits. They keep their shape and don't flex at high speeds, allowing for very precise drilling. I actually use them to make custom PCBs to build a Zilog Z80 computer, which requires an incredibly high level of precision. They don't break very easily, but can bend easily. This might not even be an issue if you're not worried about extreme accuracy. Luckily for what I make, they're pretty affordable. So if you need to drill hundreds of holes in a plastic board and like me you need high precision, buy 2 or 3 packs.