[Easy to use] No crimping required Simply graft the stripped wire into the solder connector, then heat it evenly to complete the connection. Withdrawal report: 2:1. It can work without special tools (like crimping pliers). [280 pieces of cable connectors] Included. 100 red (0.5-1 mm2), 100 blue (1.5-2.5 mm2), 60 white (0.25-0.34 mm2), 20 yellow (4-6 mm2). Double-walled design: polyolefin tubing on the outside, hot melt adhesive on the inside. Provides precise control of internal tapes and inserted wires. Allows visual inspection to prevent corrosion and form a tight seal. [Safe and Effective] The waterproof heat shrink connector series is made of insulated heat shrink tubing, which is environmentally friendly and flame retardant, which provides functions electric high tensile strength, waterproof and leakproof. Improves contraction force, provides insulation sealing, strain relief and cable control. [Wide range of applications] 280 butt connectors are available in 4 different sizes, which are used in the automotive, railroad, personal vessel, aerospace, power and electronics industries. Step 1 Thread the connector onto one of the wires, then twist the two wires together. Tip: Make sure the ends of the wires you remove are clean and tidy (shiny). Step Two Move the connector to the middle of the conductor. Tip: Be sure to strip the ends of the wires long enough so that they overlap and remain within the area of the sleeve. solder. Step 3 Use a heat gun with a reflector nozzle to slowly and evenly heat the connector until until it melts with the yarn. Tip: Some of our customers may use a lighter to complete the joint, but we highly recommend using a heat gun to shrink the connector, especially for beginners. No crimping required Excellent cabling solution for hard-to-reach or space-limited areas. Since these solder wire connectors do not require crimping, you can easily use them in hard-to-reach or space-limited environments.