Material: Lever wire connectors with high quality flame retardant insulation material, which has the advantages of long life, corrosion resistance, aging. Safe and efficient: It has the fewest installer possibilities for error of any connector, like not tightening wire properly or with sufficient torque. It is very good at preventing thermal cycling release of wires connected together. Universal compatibility: The connector for joining braided and solid wire and wires of differing sizes. They work with most every gauge of normal household wiring: ceiling fans, sockets, switches, cars, motorcycles, ships, loudspeakers, lamps, electrical boxes, chandeliers, light switches, fan controls, and much more.