Features: Marine and Automotive Grade: Made with quality materials, our electrical crimp connectors are ideal for boat, truck, and stereo joints, ensuring reliable and long-lasting connections even in harsh marine and automotive environments. Waterproof and Insulated: Electrical butt splice wire terminals feature a waterproof and insulated design, protecting your wires from moisture and corrosion and ensuring safe and secure connections. Easy to Use and Reusable: Heat shrink butt wire connectors are easy to use, simply insert the wires into the connector, apply heat, and watch as the connector shrinks and seals the wires together. Versatile: Our 50-piece heat shrink wire connectors are versatile and can be used for a wide range of applications. These connectors are ideal for use in automotive, marine, and truck stereo joints. Convenient Storage: The kit comes in a storage case, making it easy to keep everything organized and in one place. Specification: Insulation: PE Plating: Tin Terminal Body: Copper Quantity: 50pcs/box Red: Diameter 3.0mm, Cable cross-section 0.5-1.0mm² 22-18AWG(20Pcs) Blue: Diameter 5.0mm, Cable cross-section 1.5-2.5mm² 16-14AWG(15Pcs) White: Diameter 1.5mm, Cable cross-section 0.25-0.34mm² 26-24AWG(10Pcs) Yellow : Diameter 6.0mm, Cable cross-section 4.0-6.0mm² 12-10AWG(5 Pcs) Features: 1. An easy one step connection of wires, soldered, insulated and sealed. 2. Can be used in marine and automobile applications. 3. Polyolefin tubing in outside and hot melt adhesive in inside. 4. Solder and seal and with advanced waterproof function. 5. Polyolefin heat shrink butt connectors improved pullout strength, provides seal, strain relief, cable check, and insulation. Include: 1 Box * 50pcs Heat Shrink Connectors 1 * Storage Box