The function of this extension cable: 1. Extends the 4-pin CPU power supply cable; 2. Convert the 4-pin plug on the old power supply to an 8-pin plug to fit the 8-pin CPU power port on the motherboard.Plug and play, convenient and fast, safety lock at the plug to prevent accidental falling off.8 Inches (20cm), 1007 18AWG Tin-plated copper wire, strong conductivity, corrosion and oxidation resistance.The wire sheath is made of PVC, insulated, flame retardant and safer.The mesh sleeve effectively manages the wires inside your computer case, making your computer case look neater.