Waterproof, insulation and anti-corrosion: Its double-wall design (outer polyolefin tube, inner hot-melt adhesive and solder) ensures perfect insulation and sealing performance, and can prevent wire corrosion even in harsh environments. Wet No Slip Wires Connect: The hot melt characteristics of the inner seam ensure strong tensile strength and tear resistance. When heating, the solder melts to firmly hold the wire, never slip out of the connector Easy to use: Without crimping, just place the stripped wires into the solder sleeve and control the temperature evenly with a heat gun to complete the connection. The clear sleeve allows for precise visual inspection during connection Widely Used: Our solder wire connectors are optimal for your vehicle, marine, aircraft, home, and even science project, ensuring a safe, weather-resistant solder. severe weather! Comes with a case with compartments for easy storage and portable use Sufficient quantity: 250PCS high quality solder wire connectors, include 35 red (0.5-1mm), 30 blue (1 ,5-2.5 mm), 25 white (0.25-0.34 mm), 10 yellow (4-6 mm), 150 black. Specific color for specific size, shrink ratio 2:1 GOOD PACKAGING: Package comes with 18 electrical terminals and lugs 1200 types (Red:590pcs, Blue:490pcs, Yellow:120pcs) in sizes most commonly used. STANDARD MATERIAL: Advanced Copper + PVC + Tinplate. Crimp connectors conform to BS4579 and BS4G178 USED FOR ELECTRICAL REPAIR: A handy accessory of terminals and connectors includes quick electrical repairs. EASY ACCESS AND STORAGE: One box assorted kit which contains 1200pcs most popular wire connector connectors. MULTIFUNCTION: Ideal for garages, electricians, mechanics, workshops, etc. Suitable for cars, vans, etc.