... have passed through ISO9001-2000 quality management system in the same industry, We make the product strictly by ... darkening, chrome or nickel plate 3) Size: M3-M56 4) Grade:4, 6, 8, 10,2. Hex nut : 1) ... 3) Size: M3-M56 ; Nominal size:6- 27 4) Grade:4, 4.8, 6, 8, 8.1, 10, 5) Model ... blue, yellow, black) darkening, chrome ,nickel3) Size: all kinda 4) Standard : ISO, DIN ,BS,ANSI etc5) model: DIN98 , ...