Coating Raw Material Coating Type Zinc plated Yellow zinc plated Zinc nickel Raw Material Steel 6 Steel 8 Steel 10 Stainless Steel A2 Stainless Steel A4 DHm1SM8x18613M10x110717M10x1,2510717M12x1,512919M12x1,2512919M14x1,5141022M16x1,5161124M18x1,518,51427M20x1,5201530M22x1,5221632M24x1,5241636M24x2241636M30x1,5302346M30x2302346