【High Quality Material, Tight Sealing】The connector is composed of a heat shrinkable tube and a fusible solder sleeve. When heated, the premium 3:1 shrink ratio tube shrinks into a tight seal to prevent moisture and wire corrosion after sealing.【Easy to Use】Just put the bare wire into the solder joint, adjust the temperature evenly with a heat gun to connect, the transparent sleeve can provide accurate visual inspection during the connection process.【Color Coded for Easy Identification】Includes 250 waterproof heat shrink connectors as shown. Different colors allow for easy identification. The pipe size is reduced, the solder melts and flows through the bare wire, ensuring a firm grip and your wires never slip out of the connector.【Widely Cited】Soldered electrical connectors are not only suitable for electronics, railways, ships, automobiles, motorcycles, aerospace and other fields, but also for other industrial and outdoor applications.