Solder Seal Wire Connectors. Self-Solder Heat Shrink Butt Connector Waterproof Insulated Electrical Butt Splice Wire Terminals for Marine Automotive Aircraft Boat Truck Stereo Wire JointFEATURES: ¡¾Fast AndEasy operation¡¿All it takes is a hot air gun to control the temperature and connect in a confined. narrow space. Solderless & crimples. easier to operate and saving more time than heat shrink butt connectors. ¡¾Waterproof¡¿Polyolefin tubing in outside and hot melt rings in inside effectively improve waterproof performance of Solder Connectors. ¡¾Fit for Confined and Narrow Spaces¡¿ Can be bent after connection and no need to crimp or solder in the confined area. just control the temperature via a heat gun. ¡¾Easy to Identify¡¿Specific color for Specific size. easy to pick up for use. ¡¾Time Saver: Solderless & Crimpless¡¿. all you need is just a heat gun to finish the connection. much faster and easier than the old way. SPECIFICATIONS: Item Weight 3.84 ounces Product Dimensions 5.3 x 4 x 1.2 inches PACKAGEINCLUDE:1.30 x White Connectors: Diameter 1.7 mm. able cross-section 0.25-0.34 mm (A.W.G.:26-24);2.40 x Red Connectors: Diameter 2.7 mm. Cable cross-section 0.5-1.0 mm (A.W.G.:22-18);3.40 x Blue Connectors: Diameter 4.5 mm. Cable cross-section 1.5-2.5 mm(A.W.G.:16-14);4.10 x Yellow Connectors: Diameter 6.0 mm. Cable cross-section 4.0-6.0 mm(A.W.G.:12-10).