What I think is funny is that lumber and carpentry over there are done in units of 300mm for exactly the same reason we use 12 inches per foot: divisibility. Di

What I think is funny is that lumber and carpentry over there are done in units of 300mm for exactly the same reason we use 12 inches per foot: divisibility. Divisibility by 10 is useless for these types of projects, but divisibility by 3 and 4 are not!. And 300mm is just another name for the foot. You say that you’re using metric, but you’re really not. Your ancestors just uselessly multiplied all the numbers by 25.