Handy kit containing 4 ft. of 1/16" diameter solder and 1/2 fluid oz. of No. 509 flux. Unique cadmium-zinc alloy for joining aluminum to aluminum and all other metals (except magnesium). Takes to an anodized surface. Superior strength. Specially suited to refrigeration and air conditioning applications. Working temperature approximately 509ºF (265ºC). Tensile srength up to 29,100 psi.