Features: Function: These good-quality heat shrink butt splice connectors for wire connection that provides excellent waterproof sealing and protection from mechanical damage combined with Anti-Corrosion effect. Easy to Use: Just heat these solder seal wire connectors and they will easily connect both sides of the wires and seal them up to make a reliable waterproof connection. Design: The outer layer of connector tube is made from polymer that shrinks under the heat and two glue compound circles on both sides of a tube, which will seal the connection and will make it waterproof. Quality Material: Waterproof, polyolefin tubing outside and hot melt adhesive inside. With 4 sizes and in total 100 pcs in one case, convenient to use and meet more requirements. Pratical: Improved pullout strength and better insulation. Install easily, can be ideal used in marine and automobile applications. Specifications: Material: PE+Tin+Copper Shrink Ratio 2:1 Minimum Recommended Shrink Temperature: 80°C / 176°F Minimum Recommended Solder Melting Temperature: 138°C / 280.4°F Best shrink Temperatures: 125°C - 130°C / 257°F - 266°F White Heat Shrink Butt Connector: Diameter 1.5mm, for cable cross section 0.25-0.35mm², AWG 26-24 Red Heat Shrink Butt Connector: Diameter 3mm, for cable cross section 0.5-1.0 mm², AWG 22-18 Blue Heat Shrink Butt Connector: Diameter 5mm, for cable cross section 1.0-2.5 mm², AWG 16-14 Yellow Heat Shrink Butt Connector: Ddiameter 6mm, for cable cross-section 4.0-6.0 mm², AWG 12-10 Notes: 1. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. 2. Please allow slight dimension difference due to different manual measurement. Include: 100pcs*Heat Shrink Butt Connector