BernzOmatic SRC300 3 oz. Lead Free Rosin Core Solder Rosin-core base eliminates the need for flux Melting temperature of 430 F/ 221.1 C Ideal for electrical applications such as wiring Speakers, small motors and appliances, and for general electronic repairs Diameter of .062 in. (1.6 mm) or .040 in. (1 mm) Not intended for plumbing applications