DIN 435 Square Washers 1.Delivery time:7days 2.OEM:manufacturer 3.ISO9001: ... carbon steel, medium carbon steel, high carbon steel, Stainless steel,copper,phosphorization, dacromet,cuprodine.Material grade A2,A4, 4.8,6 ... for it. superiority Good quality,free for samples. DIN 435 Square Washers