Anyone know how to change the two?

I used to buy screws in No6, or No8, etc, but now they are all 3mm, 3.5mm, 4mm, 4.5mm, etc.

So what's what?

TIA, Alcazar

Have a look at this link.From Screwfix.

Metric/Imperial Conversion Chart (http://www.screwfix.com/app/content/campaignTemplates/Scr/Scr_Top_Popup03.html)

Thanks for that. I've looked on the Screwfix site but never come across that before.

They USED to put it in their catalogues, but the catalogues are now so large that finding anything like that is an hour's work:D

Alcazar