Good Tightness - Dual Wall Adhesive Heat Shrink Tube has the advantages of good electrical insulation, good sealing and high temperature resistance. After being shrunk, it's thick and stays stuck, the tube snug around the wire, or cable and also closes around the connector. And give you a tidy connection or electrical insulation. | Widely Use - Our heat shrink tubing are widely used in wire connection, rust prevention and corrosion protection of solder joints, protection and insulation processing of wire end, wiring harness and electronic components, and audio and electrical DIY. Fitness equipment parts and steel structure surface protection and so on. | Easy Use and Fast - You just use a heat gun heat it evenly until it wrap the wire or connector tightly. It is a 3:1 heat shrink ratio and will shrink to the original 1/3. (Temperature of your heat gun is up to 212℉, then glue inside will soften and seal the connection.) | Safe & ECO-Friendly - Our heat shrink tubing are UL certified, RoHS compliant, which ensures its safe and environmental protection. Protect you and your family. | Multiple Size - This is 4 feet long 1/2" in diameter large heat shrink tubing (Note: it is 1/2" in round diameter, but not 1/2" in width). Other sizes also available in our store, like 3/4", 1" ,1.5", 2". our worry-free 24-month and friendly customer service ensure pleasant shopping experience.