Welcome!This sale is for two wire connectors that normally come with your "Nest Power Connector" thermostat adapter. (The Power Connector adapter is not included in this sale)
These terminals are used to splice the wires from the "Nest Power Connector" adapter to the existing wires at your heating/cooling control electronics.
These will take wires sizes from 24 AWG to 14 AWG. They are very handy and easy to install!
Feel free to contact me with any questions you may have. Thanks for looking!Mark