3M™ Scotchlok™ Butt Connector is used to connect two single wires making an in-line splice. This butt connector is non-insulated and uses chamfered barrel ends to provide fast easy wire insertion from both ends and a built in wire stop for correct positioning. It must be crimped at ends. 3M™ Scotchlok™ Butt Connectors are UL Recognized and CSA certified.