●Easy to Use: Heat shrink wire connectors can be connected with a heat gun; no crimping tool or soldering machine is needed. ●Waterproof and Insulating: Solder seal wire connectors with low heat solder and hot melt adhesive can produce a perfect seal, which helps to be better waterproof. ●Wide Applications: Wiring kit are ideal for marine, automotive, trailer and other outdoor applications. ●High Quality: Solder Seal Rings: Use exclusive wire connectors material to avoid melting shrink tubing before soldering. ●Package Includes: You will receive 500 pcs waterproof butt connectors.