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Product Description For Tube A (mm) Grade Part Code 40*40 AISI 304 Best BE5-1 40*40 AISI 316 Best BE5-2 Best Precision Metal has talented engineers ready to help with your design needs. We have a modern CNC machine shop and best stainless is ground, buffed and polished by hand to a mirror finish to assist in making a quality part. In the passivation process after buffing, acid and rinsing remove surface contaminants from the products and produce a hydrous oxide film which enhances corrosion resistance. Every production shipment tested and certified