Solder Like a Pro! 🔥 Certified ROM1 per J-STD-004 for professional reliability. Perfect for soldering a variety of common metals. Lead-free formulation for a safer workspace. 3.3% rosin flux ensures instant-action wetting. Crafted for flawless soldering with a 0.031" diameter. Instant Wetting 0.031" Diameter Lead-Free The KesterSOLDER 24-7068-1402 is a premium lead-free solder wire designed for professional use. With a diameter of 0.031 inches and a rosin core containing 3.3% flux, it ensures superior wetting and performance. This 1lb spool is perfect for soldering various metals, making it an essential tool for any technician or DIY enthusiast.