Originally Posted by keith_d

Like most of the old farts I use imperial and metric depending on what I'm doing. But my favourite measure is planed timber, which always comes in odd sizes like 22mm. So how do you end up with 22mm???

Easy, start off with 1" sawn timber, plane off 1/16" all over, then round down to the nearest number of millimeters = 22mm. (imperial = 1" PAR)

Of course it's sold nice metric amounts too, 2.4m and 1.8m (8' and 6')