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we need to purchase the following materials:120 pc of Hex.head screw M12 - 1.75 x 30mm long ASTM A-193 Gr. B7280 pc of Hex.head screw M12 - 1.75 x 35mm long ASTM A-193 Gr. B7160 pc of Hex.head screw M16 - 2 x 45mm long ASTM A-193 Gr. B7120 pc of Hex.head screw M20 - 2.5 x 55mm long ASTM A-193 Gr. B7 screws, a193 b7, bolts screws, laminates, stainless steel bars, bolts, nuts, perforated laminates, mesh lined stainless steel sheets