1.High Quality Material, Waterproof and SealedThe connector is made of heat shrink tubing and fusible solder sleeve. When heated, the high quality heat shrink tubing with a 3:1 shrink ratio shrinks to form a tight seal to prevent moisture and wire corrosion after sealing. 2 .Simple ApplicationThe connection can be made by simply placing the bare wire into the solder joint and adjusting the temperature evenly with a hot air gun. The transparent sleeve can facilitate precise visual inspection during the connection process. 3.Widely Quoted500 soldered electrical connectors are not only suitable for electronics, railways, ships, automobiles, motorcycles, aerospace and other fields , but also to other industrial and outdoor applications. 4.Color coding is easy to identify 5 colors, including 50 waterproof red wire connectors, 50 blue wire connectors, 20 waterproof connectors yellow wires, 40 white wire connectors , 340 black wire connectors and 500. Different colors make it easy to identify. Wide Applications: Our solder sealed connector kits are suitable for ships, vehicles, airplanes, homes and even some items that ensure a firm weld. Specifications: Shrinkage ratio: 3:1 Working temperature: -50C~125C Full shrinkage temperature: 130C Dissolution start temperature: 125 C Full dissolution temperature: 150 Features: Using double wall design, polypropylene tube + hot melt adhesive layer. The heat-shrink tubing has high tensile strength and is easy to connect and solder wires. Contains a hot melt adhesive to provide sealing after sealing and prevent wire corrosion. Transparent case, convenient for observation of wire insertion, simple and convenient to use. Package includes: 40 x white (AWG 26-24) diameter: 1.7mm, cross section: 0.25-0.34 mm 50 x red (AWG 22- 18) Diameter: 2.7mm, cross section: 0.5-1 mm 50 x blue (AWG 16-14) diameter: 4.5mm, cross section: 1.5-2.5 mm 20 x yellow (AWG 12-10) Diameter: 6mm, cross section: 4-6mm 340 x black heat shrink tubing