These connectors allow me to make highly secure and conductive connections along with sealed protection all in one step. All I have to do is strip my wires about 1/2 inch each, slide the wires into the connector and heat with a heat gun. The solder melts and provides a secure and conductive connection to the wires. The protective outer heat shrink is an insulator and protector for the connection.These make for very clean, secure and safe connections that ensure for high conductivity. My electrical/electronic projects benefit from these connectors greatly. They are also a big time saver. I highly recommend them to anyone who needs to solder and heat shrink wiring. This is fast, inexpensive and super easy. These are a terrific value for the price and they get 5 stars from me.