Easy to Use: Heat shrink wire connectors can be connected with just 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: Butt connectors are ideal for marine, automotive, trailer and other outdoor applications High Quality Solder Seal Rings: To avoid melting shrink tubing before welding, the recommended heat gun temperature: 842℉/450℃ Package Includes: You will receive 350 pcs waterproof solder wire connectors #797 in Industrial & Scientific ( ) #6 in