14mm x 1/2" long Heli-Coil aviation grade spark plug insert. 1 lbs (0.5Kg) shipping weight.
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A reliable liquid gasket sealant, dressing and coating compound that brushes on very thinly and resists temperatures of -65º to 400ºF (-54ºC to 204ºC). It will not interact with other chemicals, and dries to full strength in under 12 hours.