By the way, if you haven't tried the Maxi-Cut Forstner bits in the past, they are quite amazing. I have no personal interest in the company, don't work for them, etc. They cut very cleanly and don't clog. Nothing in common with the garden variety Forstner bits in those bargain sets. Might be worth an investment if you are cutting a lot of holes of one particular size. I'm not aware that they come in metric sizes though...