Screw On Wire Nuts are the most common type of wire connectors. They are little round plastic caps that twist over the bare ends of wires to make tight connections.
Ceramic Screw-On Wire Nuts
Ceramic Screw-On Wire Nuts
The shells of these twist-on connectors insulate and protect conductors from high temperatures. They are suitable for applications, such as ovens and furnaces, commercial lights and signs, and appliances.