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With people's weight, I can only go by stones and lbs. Height of someone in feet and inches. Kitchen unit widths in millimetres. Door widths 2', 2' 3", 2' 6" etc.. I can't do metric on those but the height is 1981mm (6' 6"). Brick length and height in millimetres, sand and cement in kilos. Set roof tiles out in imperial. I can only follow centigrade.Around 1978, US domestic vehicles started using metric fasteners mixed with SAE. It was a PITA. Many mechanics had to buy metric tools. Myself, I didn't have to since I worked on Japanese motorcycles. To be honest, I prefer metric.
So I have a mishmash of both.
Wood screws are metric, so to self tap into thin steel, I drill a 3mm hole and use a 3.5mm screw. If it's thick steel, the half millimetre is too much, I need a closer sized hole to the screw width, so I use an 11/64ths drill bit (4.365mm) and a 4.5mm screw.