SMART-O is the most advanced oil drain plug in the market, designed to offer a complete solution for the changing of oil dain plugs, prevents sudden and catastrophic oil loss, oil leaks, oil pan damage and ultimately engine damage. SMART-O oil drain plug is designed to protect engines and the oil pan. In a different way than magnetic oil drain plugs, SMART-O reduces wear on the oil pan thread and reduces risk for catastrophic oil loss which could damage the engine. Safe Seal Function Intelligent material O-Ring expands up to 10% - 20% when exposed to engine oil. This seals the oil pan from inside the thread rather than just from the outside. SMART-O plugs provide powerful, safe sealing beyond any other oil drain plug system in the market. The use of SMART-O plug prevents oil leaks and ultimately engine damage. Anti-Vibration O-Ring acts as an interference to prevent natural self-closing of plug, caused by engine vibration. This prevents SMART-O from falling out due to vibration over time, if not tightened properly. This also prevents self-loosening through vibration, oil leaks and ultimately engine damage. *Tested by the Oakland University Fastening & Joining Institute and Spectrum Technologies, Michigan. Proven to resist excessive vibration forces. R20 Tech Specs: Thread Diameter x Pitch: M14x1.25 mm Hex Top: 13mm Plug Material: Low carbon steel Plug Finish: Black oxide