M8 x1.25mm pitch; 13mm across flats; 6.5mm thick. M12 x1.75mm pitch; 19mm across flats; 10mm thick. M10 x1.5mm pitch; 17mm across flats; 8mm thick. M4,M5,M6,M8 A2 Stainless Steel. M5,M6,M8,M10 A2. M6 x1mm pitch; 10mm across flats; 5mm thick.