... steel,stainless 2.Size:M6-M22 3.Surface:black.zinc plated... FLAT WASHER DIN1251, Material: Alloy(45H...) and Carbon steel(A3...),stainless ... (304)2, Size: M6-M223, Surface: plain, black oxide, zinc plated,4. Packing: plastic bag in box, boxes in per carton ... .All of the products can be produced by customers' requirements. Flat Washer DIN125