50pcs Solder Seal Wire Connector, Sopoby Solder Seal Heat Shrink Butt Connectors Terminals Electrical Waterproof Insulated Marine Automotive Copper(23Red 12Blue 10White 5Yellow) <span class="a-text-bold">4 Types</span>of Solder Seal Wire Butt Terminals---Yellow(A.W.G.:12-10), Blue(A.W.G.:16-14), Red (A.W.G.:22-18), White(A.W.G.:26-24). <span class="a-text-bold">5 x Yellow</span> Connectors: Diameter 6.0 mm, Cable cross-section 4.0-6.0 mm<br> (A.W.G.:12-10); <span class="a-text-bold">12 x Blue</span> Connectors: Diameter 4.5mm, Cable cross-section 1.5-2.5 mm<br> (A.W.G.:16-14); <span class="a-text-bold">23 x Red</span> Connectors: Diameter 2.7 mm, Cable cross-section 0.5-1.0 mm<br> (A.W.G.:22-18); <span class="a-text-bold">10 x White</span> Connectors: Diameter 1.7 mm, Cable cross-section 0.25-0.34 mm(A.W.G.:26-24). 1. Select the right size of connectors for the wires. 2.Insert the 2 wires to the connector. 3.Use a <span class="a-text-bold">heat air gun</span> until it is melted in size and the adhesive flows, filling gaps within the terminal. Dual-Walled design, Polyolefin tubing provides Insulation &amp; improve Pullout Strength. After melting, the wires are sealed and tightly connected.