Anyone got an idea whether it matters a lot that most of these clips are aimed at a US audience? Apart from the fact they all measure things in feet and inches, that I can convert, I often worry about whether the same type (sizes) of parts even exist or whether certain standards work the same was in the EU as US (safety stuff you don't want to mess up, like how electrical wiring always runs vertically above or below power outlets, so you know where to drill safely).