密封盖，客户：美国 材质：灰铁250 Sealing cover, customer: America, Material: gray iron 250 注释：以上为我公司客户样品，本公司只展示自己的铸造与机械加工水平，但不销售客户的任何现有产品或者样品。 Note: the above are samples of our customers. We only show our casting and mechanical processing level, but do not sell any existing products or samples of our customers.