Premium Quality: The thick copper body ensures a strong and secure crimp every time, providing minimal voltage drop, high current, and less heat. These will prevent short circuits and problematic wiring that poor quality connectors are known for Durability: Each butt, ring and fork terminal is made of a thick tin-plated copper body, which resists corrosion and holds the wire tight when crimping. The barrel is made from a single piece of copper, which eliminates the problem of barrel openings. Your wires will never slip out of the connector Waterproof: The insulating tube has a unique double-walled design. The heat shrink tube 3: 1 high quality features a heat activated sealing liner to provide a secure 360 degree seal. Fireproof, waterproof, can be used underground WIDE APPLICATIONS: Compliant with all electrical standards, ideal for marine and automotive applications, whether you're working on a boat, vehicle, home or science project, our electrical crimp connectors will provide a solid seal, ensuring everything comes together properly < p>Type and Size: The connector assortment includes red, blue and yellow connectors for wire sizes from 22 to 10 AWG. Five types of connectors: mating connector, ring connector (stud size: #10, '', 5/16'', 3/8''), female quick-disconnect connectors, male quick-disconnect connectors and spade connectors (stud sizes: #10) are packaged in each connector kit.