Harris 50/50 tin-lead solid wire solder is a general-purpose lead-bearing solder composed of 50% tin and 50% lead, available in a 1/8-inch diameter on a 1 lb spool. With some exceptions, it can be used to solder copper and most copper alloys, lead, nickel alloys, and steel, making it well-suited for a wide range of sheet metal and industrial soldering applications. Heat sources compatible with this solder include soldering guns, irons, and air-fuel torches. It is not recommended for joints subject to high stress or vibration in the cooling industry, and must not be used in plumbing or potable water system applications.