1.hex nut made of brass, steel, stainless steel 2. M6-M24 cold forged 3. M27-M90 hot forged Hex NutHex nut made of steel, stainless steel, brass, aluminumStandard: DIN, ASME/ANSI, JIS, AIS standardDimension according to standard or customs designSize: M4, M5, M6, M8, M10, M12Inch size is also availableDifferent surface finish is available Class: 6,8,10,12