Simple operation: you can just put 2 stripped wires into the solder sleeve and heat it with a hot air , and the insulating tube shrink with a shrinkage ratio of 2:1, forming a waterproof seal, thus completing the connection Practical design: these solder sealing joints are different from ordinary heat shrinkable tubes, and adopt solder ring design without crimping The solder sealed terminal is parent 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 melt ring, which promote waterproof performance effectively, popular in the automotive and marine industries What you get: you receive 500 pieces of 22-18 AWG red heat shrinkable butt connectors, with heat shrinkable, waterproof and conductive features, they can meet your needs, bringing many conveniences Wide range of uses: the insulation butt joint is a useful tool to provide 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 products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.