These are style connectors which are used to connect multiple solar panels or groups of solar panels together in a solar field, and typically used in parallel applications. The included assembly tool makes it easier for users to quickly and easily tighten and separate the connectors. Features: With excellent aging resistance and UV endurance, it can be used in harsh environment. The O ring on connector is perfect to seal out water and dust to prevent corrosion. Cable connection adopts method of rivet and lock, quick & simple for assembly. The included assembly tool makes it easier to tighten and separate the connectors. Great solution for parallel connection of multiple panels together in a solar field. Specifications: Quantity: 20 Pairs Rated Current: 16A(2.5, AWG14), 30A(4, AWG12), 52A(6, AWG10) Withstanding Voltage: 1000V DC Typical Contact Resistance: 2m Suitable Cable Size: 2.5mm/4mm/6mm Protection Class: Class Protection Degree: IP67 Insulation Material: PPO Contact Material: Copper, Tin Plated Flame Class: UL94-V0 Ambient Temperature Range: -40C ~ +105C Insertion Force: less than 50N Withdrawal Force: over 50N Package Weight: 213g-407g / 7.52oz-14.37oz Note: The color of spanner will be sent randomly(blue or orange), please in kind prevail. Package List: 20 * Pairs Connectors 2 * Spanner