Simple operation: you can just put 2 stripped wires into the solder sleeve and heat it with a hot air , and the insulating tube will shrink with a shrinkage of 2:1, forming a waterproof seal, thus completing the connection Practical design: these solder sealing joints are different from heat shrinkable tubes, and adopt solder ring design without crimping; The solder sealed terminal is transparent and can be accurately inspected when the wire is peeled off and inserted inside Insulated and waterproof features: the electrical wire terminal are designed with an outer polyolefin tube and inner hot ring, which will waterproof performance effectively, in the automotive and industries What you will : you will receive 500 pieces of 22-18 AWG red heat shrinkable butt connectors, with heat shrinkable, waterproof and features, they can your various needs, bringing many conveniences Wide range of uses: the insulation butt joint is a useful tool to good protection for electric wires, which is often applied in automobiles, ships, motorcycles and vehicles, and can also be applied in scientific wiring projects Material:nylon colour:red Package Contents: 500 x heat shrink wire connectors Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.