Connect and Seal your Wires without crimping or terminals! EASY TO USE - Simply position the 2 stripped wires into the solder sleeve and apply heat to finish the connection. The solder will gradually flow, and the insulation tubing will shrink down, creating a waterproof seal. Unique dual walled design- Color-coded tubing makes it easy to identify the right size connector for every application. Measure your wire, and easily choose the right connector by looking at the wire size chart on the box. GREAT FOR PROFESSIONAL OR EMERGENCY USE - Melted Solder ensures wires strongly connected and avoids wires slipping out from the terminal. COMPLY WITH ALL RELEVANT STANDARDS: ROHS, ISO 9001:2015, SGS and CE standards.