Welcome to our store! 1. Qualified heat shrink butt connectors that can fully meet your needs in various electrical projects. 2. The melted solder ensures that the wires are firmly connected and prevents the wires from slipping out of the terminals. 3. Made of high-quality plastic, these terminals have excellent sealing, strain relief, wire management, and insulation properties. 4. Features a 2:1 shrink ratio, -55℃ -125℃ operating temperature, 80℃ minimum shrink temperature, and 138°C minimum solder melting temperature. 5. Can be used in ships, vehicles, and homes, providing stable soldering, increased current carrying capacity, and weatherproof connections. Item Type: Solder Sleeve Material: Plastic Quantity: 1 box (250 pcs) White Solder Sleeve SST-S11 (40 pcs) Red Solder Sleeve SST-S21 (100 pcs) Blue Solder Sleeve SST-S31 (90 pcs) Yellow Solder Sleeve SST-S41 (20 pcs) Size: Red Connector: Approx. 2.7mm/0.11 inch in diameter, wire cross-section 0.5 to 1.0 mm² Blue Connector: Approx. 4.5mm/0.18 inch in diameter, wire cross-section 1.5-2.5 mm² White Connector: Approx. 1.7mm/0.07 inch in diameter, wire cross-section 0.25-0.34 mm² Yellow Connector: Approx. 6.0mm/0.24 inch in diameter, wire cross-section 4.0-6.0 mm² Operating Temperature: -55℃ to 125℃ (-67°F to 256°F) Minimum Shrink Temperature: 80℃ (176°F) Minimum Solder Melting Temperature: 138°C (280.4°F) Shrink Ratio: 2:1 Shrink Start Temperature: 80℃ Solder Ring Melting Start Temperature: 111℃ Solder Ring Fully Melted Temperature: 138℃ Application: Whether working on your boat, vehicle, home, or a scientific project, our heat shrink solder and seal connectors will ensure solid soldering, increased current flow, and weatherproof connections every time. 1 box of solder sleeves (250 pcs) Customers are our top priority. If you find any problems with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best customer service.