the Female DC 2.1mm Socket to Screw Terminal Block ·         Adapter with Philips Screw Terminal Block to Female DC Socket Connection ·         Material: Plastic & Nickel plated Brass ·         Size: 2.1mm ·         Gender: Female   This enables a fast and easy connection of DC power from bare wire to the socket type which fits into the plug from the power supply.  A very much faster way of connecting up your cut-length of cable, and additionally it means you don't have to cut into the cable coming from your power supply unit.  Thus, replacement, disconnection for test, ease, guarantee cover, etc., is all a whole lot easier.