  == Inter/national standards ==  I am finding this page confusing or at least not confidence-inspiring because differences between various national or international standards are not made clear. For example, wood screw gauge is a number in the US and the UK. But is it the same number? Are US inches even the same as UK inches? The page doesn't say, and it refers to gauges without saying which system they come from. Hence, my lack of confidence in the information in this page ... yes, yes, I should add this info myself. But it's not my area of competence, which is why I came here in the first place.   