Features: Effortlessly seal and insulate wire connection (0.25mm² 6.0mm²) with pressure release heat shrink tubing containing pre installed solder rings, eliminating special tools through simple heat application. Integrated thermal adhesive melts during heating to fill gaps, while flame retardant nylon construction withstands 55℃ to 125℃ for sturdy waterproof insulation and electrical safety. Essential for electricians, automotive technicians, and craft enthusiasts requiring efficient waterproof connection in electronics repairs or vehicle modifications. Perfect for creating moisture resistant joints in outdoor lighting systems, marine equipment, industrial machinery, and household appliance wiring projects. Achieve professional grades solder sealed connection in seconds using common heat sources like lighters or heat guns, ensuring sealed protections against corrosions and short circuits. Specifications: Materials: Nylon Tube Size:As Shwon In The Picture Package Includes: 50Pieces Pressure-release Soldering Rings note: Please allow 1-3cm error due to manual measurement. please make sures you do not mind before you bid. Due to the differences between different monitors, the picture may not reflect the actual color the item.