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- 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.