YINETTECH 2pcs Spark Plug Thread Adapter M18x1.5 to M14x1.25 Brass Reducer for Vintage Motorcycles

["- Precise Fit for Vintage Motorcycles: Allows M18x1.5 spark plug holes to accept M14x1.25 spark plugs for easy modernization.","- Durable Brass Construction: Corrosion resistant and heat tolerant for long service in engine environments.","- Secure Thread Conversion: M18x1.5 male to M14x1.25 female for tight seal and leak free performance.","- Quick Install: Screw in design enables fast retrofit with standard tools.","- Stable Ignition: Maintains plug alignment and seating to support smooth engine operation."]