Features 1、Solder seal heat shrink wire connectors, provide you with qualified terminal to meet your needs in various wiring projects. 2、Melted solder ensures that the wires are firmly connected and prevent the wires from slipping out of the terminals. 3、It is suitable for ships, vehicles and homes, it can ensure firm welding, increased current and weatherproof connection. 4、Excellent sealing, strain relief, cable check and insulation performance. 2:1 shrink ratio, simple one‑step wiring. 5、No soldering and no crimping, saving you a lot of time. Compact in size, it can be easily used in hard‑to‑reach or space‑limited environments. Specification Item Type: Heat Shrink Butt Connector Material: Plastic Quantity: 1 Box (120pcs) Solder Sleeve White SST-S11(30PCS) Solder Sleeve Red SST-S21(40PCS) Solder Sleeve Blue SST-S31(40PCS) Solder Sleeve Yellow SST-S41(10PCS) Size: Red connector: Approx. 2.7mm/0.11in in diameter, cable cross-section 0.5 to 1.0 mm² Blue connector: Approx. 4.5mm/0.18in in diameter, cable cross-section 1.5-2.5 mm² White connector: Approx. 1.7mm/0.07in in diameter, cable cross-section 0.25-0.34 mm² Yellow connector: Approx. 6.0mm/0.24in in diameter, cable cross-section 4.0-6.0 mm² Operating Temperature: -55°C to 125°C (-67°F to 256°F) Minimum Shrink Temperature: 80°C (176°F) Lowest Temperature of Solder Melting: 138°C (280.4°F) Shrinkage Ratio: 2:1 Temperature that Start to Shrink: 80℃ Temperature that Solder Ring start to Melt: 111˚C Temperature that Solder Ring Melt Completely: 138˚C Application: Whether you are working on your boat, vehicle, home or scientific project, our heat shrink solder and seal connectors will ensure solid soldering, increased current flow and weatherproof connections every time. Package List 1 Box of Heat Shrink Butt Connector (120pcs)