OK, how can a picture frame be "approximately" a size both in Metric and Imperial?

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Panting like a fiend
Minor rant, as i'm looking for a picture frame :p

But how the hell can a retailer (large chain) get away with selling a picture frame that states it is (in about size 36 font) 20x16", (in about size 24 font) 500x400mm and then in about a size 8 font "all sizes are approximate"

When a 20x16 frame should be 508x406mm, and the frames are in reality something like 495x397mm? (the best one I saw was actually just on the 500x400mm sizing, barely).
It doesn't match either size, and is very out for the one stated in the largest font.

When you get a 20z16" print it's 20x16" (a standard size for paper), so why the difficulty making frames for it?
When you buy wood that is "approximately" a size you know that normally it's actually going to be larger if anything (it tends to be the larger size stated), when you buy paper you know it's going to be the size it states, so how do they get away with selling frames that aren't anything like the size stated?


Sorry, minor rant as I've looked in about 3 different stores at frames and they've all had this sort of problem :p (I've had this problem before with other sizes, which makes me very wary of ordering a frame online).
 
The actual 'viewable area' is smaller than the stated size so unless the edges are critical it shouln't really matter. I mount my prints before framing anyway to get rid of this problem. A 500mmx400mm mount will fit in a 20"x16" frame without any visible gaps and vice versa.
 
With a frame you want it to be, if anything, smaller than stated. Clipping a couple of MM off the edges of a print is hardly noticable, wheras the other way round it would be.
 
Everything is approximate. If you consider the Heisenberg uncertainty principle, the more accurately you know the position of an object the less accurately you know its speed. Therefore to measure both sides "perfectly" and hence be able to calculate the size "exactly", the picture frame could be moving anywhere at any speed. Then try and see you photos :)
 
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