Please note that the screw of this product is made of 304. It is normal for the rust and rust on the microbial and chemical reaction of seawater. Please use it after washing. Rinse with water and brush with toothpaste and toothbrush. Please clean the nut. Wash with a cotton swab dipped in toothpaste. After wiping the water, apply a layer of silicone grease to protect the surface. Please check the water before diving for the next layer of silicone oil. It will not rust easily.
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