Check the listing for details. Soldering Iron Tips T12-K 4.5mm Tip Width Knife Tip Solder Replacement Tip. Condition: New. Listed at 16.46 USD. The soldering iron tips feature an oxygen-free copper core for excellent heat conduction and rapid heating. The exterior is nickel-plated, offering corrosion and wear resistance, which extends the lifespan of the soldering tip. It also enhances the thermal conductivity of the tip.The knife-shaped design allows users to perform precise soldering operations on small and narrow solder points, ensuring soldering quality. The blade shape makes it convenient to remove excess solder and correct solder bridges that occur during the soldering process.The knife-shaped soldering tip can quickly heat up and maintain a stable temperature. The tip is easy to replace and clean, enhancing work efficiency and extending its lifespan.