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Mine measures 21" from screws to screws. Like I said I only use about 13" of the surface to strop. You could always shorten it down if you wanted. The screws make it versatile.

I have no clue as to the quality of the strops in the links, but for a few dollars more you could get one from here. Leather Hanging Strops I have one and can't complain. The one I got was the Big...