• Solid Core Solder - To be used with external flux. The user determines where solder will flow by applying flux.
• Suited for joining copper and most copper alloys, lead, nickel alloys, and steel, and general applications.
• 40/60 - For general electric wiring (40% tin, 60% lead, 460° melting point)
• Please note that general-purpose solder can't be used for plumbing applications.