====== 904L ====== **904L** is a special grade of [[stainless steel]] used by [[Rolex]] under the trademark name, **Oystersteel**. Most watches use "surgical grade" 316L stainless steel, but Rolex uses the higher-cost low-carbon 904L alloy. This alloy contains nickel, molybdenum, and copper and is highly resistant to corrosion. The high chrome content allows it to be polished to a high sheen. {{tag>Rolex Terms}}