[Simple as Can Be] Using this solder kit is easy. Just heat the wire connectors and shrink tubing with a hot air tool, and both beginners and experienced users can complete the task quickly. [Color Coded] Never reach for the wrong piece again. The color coding system organizes each piece by length and diameter, making selection simple and efficient. [Designed for Durability] The high polymer material shrinks quickly, provides excellent insulation, and is 100% waterproof. Each piece withstands repeated use without slipping or tearing. [Versatile Applications] This kit is ideal for a wide range of electrical repairs and is essential for data protection, automotive, and outdoor uses. HOW TO USE: Select the proper size connector for the wires. Strip the wire ends and insert them into the connector. Apply heat evenly to the connector starting from both ends until the tubing shrinks and the adhesive flows. Then continue applying heat evenly until the solder sleeve is fully melted and sealed. Note: Always use a hot air tool and rotate the connector to ensure even heating. Gradually increase the temperature from low to high. Do not set the highest temperature at the beginning, as this may overheat the surface while the solder remains unmelted. Keep the hot air tool at a safe distance to avoid damage. Shrinkage ratio: 2:1 Minimum shrink temperature: 80°C Solder melting temperature: 138°C Operating temperature range: -55°C to 125°C Waterproof rating: IP67 Material: Metal + plastic Colors: Red, blue, white, yellow Package Contents: 150 x Waterproof heat shrink ring terminals (50 x red shrink connector AWG: 22-18, 50 x blue shrink connector AWG: 16-14, 40 x white shrink connector AWG: 26-24, 10 x yellow shrink connector AWG: 12-10) 1 x Plastic storage box Only the above package contents are included; other items are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.