This socket set contains sockets for Whitworth, Metric and SAE so is a go to set when you don't really know what you are working on. I have used it for about 10 years and the rusty box finally got to me so I bead blasted it and repainted it the original color. Even managed to save the inside label. It is a German set and came to me by way of the UK when shipping didn't cost an arm and a leg.