Twist-on wire connectors are a type of electrical connector used to join two or more electrical wires together. They are typically made of a plastic body with a metal spring inside. The wires are inserted into the connector and twisted together, which causes the spring to grip the wires and make a secure connection.
Twist-on wire connectors are a quick and easy way to connect wires, and they are ideal for use in a variety of applications, including electrical repairs, home improvement projects, and automotive wiring. They are also relatively inexpensive, making them a cost-effective option for many projects.