Features: The set is specifically designed for underground use. The heat shrink tubing forms a tight, sealed layer after heating, effectively preventing the intrusion of moisture, ensuring long term safety and stability for cable connection. The connectors are made from copper, ensuring excellent electrical connectivity and corrosions resistance. The heat shrink tubing is robust and stable, built to withstand the pressures of an underground environment. Easy Installation: process is straightforward. Simply strips the wire insulation, loosen the screw, insert and secure wires, then apply a heat sprayer to the tubing for a secure seal. Designed for commonly used underground direct burial cables and is suitable for 14/3 to 8/3 gauge ground cables, providing a versatile solution for various cable splicing needs. Specifications: Component: Rubber and Copper Size: about 8x1.5inch Package Includes: 2PCS Connectors 2PCS Heat Shrink Tubing note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.