Sparkplug HD no3 Beck air cooled Set 2

M18x1.5 sparkplugs, fits all Harley singles 1926-1934, all 45CI models, all Sidevalve Big Twin and Knucklehead. Beck spark plugs show the Beck logo and the heat range "3", Globe style plugs have no markings except the heat range "3". Plugs must be gapped to 0.025" (0.635mm)