It looks like you're referring to a specific product: 400 Pcs Heat Shrink Butt Crimp Solder Seal Electrical Connectors. These connectors are often used in electrical wiring projects to create secure and waterproof connections. They combine the benefits of crimping, soldering, and heat shrink insulation in one piece, making them ideal for automotive, marine, and home electrical applications.
SKU: 10004606
