(Product Description: The Traces On It Are Rust Proof Oil Applied To Prevent Rusting, Not Product Dirt Or Quality Issues.) 1pc 8cm Long Black Narrow Mouth Chromium-Vanadium Steel Japanese And European Style Oxygen Sensor Socket With Oxygen Sensor And Induction Socket Wrench-Effortless Oxygen Sensor Remover Tool - Precision Fit Narrow Mouth - Black Finish For Easy Installation/Removal, Tools For Men