Save money and get an enhanced product with McFarlane Stainless Steel Exhaust Nuts and Studs! A heat-treated, high-strength stainless alloy improvement that is rust proof. Reduce the temperature flux stress on your exhaust flanges and gaskets with these FAA-PMA approved nuts and studs for Continental and Lycoming Engines. Self-locking nuts privde a vibration resistant fastening action that will stay tight between inspections. 

• Heat-treated, high-strength stainless alloy
• Steel nuts are cad plated - better on galvanized and stainless studs
• Won't rust and are reusable

These are the good ones!