SILICONE SUPER B WIRE NUTS* Non-hardening gel moisture barrier and filled with a corrosion resistant silicone gel.* Solid dependable splice in wires ranging from 18 to 30 gauge.* Blue Color for Identification. * Waterproof for outdoor use.* Forms a corrosion resistant splice. * Easy to squeeze the soft brass crimp. * Durable protective outer covering.* Insulation piercing internal teeth* Wildly used for low voltage, telephone alarm wiring or electrical ,telecommunications industry.