Wzak, Tower Hobbies has an online standard metric converter for lenght measure and volume conversions.

I hadn't noticed that there were any metric drills, I have the 115 drill tridex that has 1 - 60, A - Z and 1/16 - 1/2 by 1/64ths. With that and a metric conversion chart, you will always be able to get within .002 inch and that is plenty close.