Easy to use: the transparent sleeve ensures precise control, tape and use of wires inside. No wire contact: the pipes reduce in size and the tin Solder melts and passes through ribbed wires for a strong hold. Polyolefin heat shrink back connector improves stretch strength, provides an insulating seal, strain relief and cable control. Application areas: application in areas such as automobile, train, navigator, aerospace, electric power and electronics, etc. p> Double wall design: polyolefin pipe on the outside and hot melt glue on the inside. Allows visual inspection, prevents corrosion and ensures a tight seal. The solder joint wire connectors 100 pcs are waterproof, insulated and heat shrinkable, allowing you to have of high quality solder and joint terminals that can last a long time. They are easy to use and provide a secure connection that can last a long time. You can connect wires efficiently and safely. Our heat shrink solder connectors ensure leak-proof, weather-resistant and efficient wire connections. -es, whether you work on your boat, your vehicle, your home or your scientific projects. These connectors are ideal for damp, humid or highly condensing areas! Technical specifications: Shrinkage ratio 3: 1 Minimum temperature for solder to melt: 138c Minimum shrinkage temperature: 80Operating temperature: -55 - 125Shrinking temperature: > 160 cDielectric strength: 1kv Protection class: IP 67 White butt connector,AWG: 26-24; Quantity: 25Red connector, AWG: 22-18; Quantity: 25 Blue butt connector,AWG: 16-14; Quantity: 30. Yellow Butt Connector, AWG: 12-10; Quantity: 10