Was about to get a toy- then I did some research...

[Juranovich]

I think you probably mean clearance hole size rather than tolerance? Google "metric clearance hole chart"

Edit: Or if I've misunderstood then ignore the above.

Precisely, tolerance, not clearance. And just for the record (and before anyone posts a lmgtfy-link :) ), I did try to google it before asking on here but using highly scientific terms like "screw hole sizes" did not yield me any useful info. Anyway cheers, I got exactly what I needed!