This item is 10 pcs DC Power Jack 2.1mm diameter center pin ==================================================== * 2.1 mm diameter center pin, * For either PCB or Breadboard use. * For breadboard use, simply solder 2 wires and plug wires onto breadboard Note: The 2.1mm diameter center pin power jack could fit AC adapters with either 2.1 mm and 2.5mm plugs |