Coating Raw Material Coating Type Uncoated Zinc plated Yellow zinc plated Zinc nickel Raw Material 17 H DdwEMSM811,614,38513M1015,618,9617(16)M1217,421,1719(18)M1420,524,49822(21)M1622,526,75824M1824,929,56927M2027,732,95930M2229,535,031132(34)M2433,239,551236M273845,213,541M3042,750,851546M3646,660,791855