Saves time: Pre-twisted wires are not required, but we recommend twisting the wires first to make a more reliable, tighter connection. Safe and : The linear connector grips the wires firmly and forms a solid connection, and the spring inserted into the flame-retardant shell has good insulation and minimal aging. QUICK: Electrical nuts are great for connecting wires, no soldering required, just press the stripped conductor into the wire cover and tighten. Applicable wires: 26 gauge - 10 gauge wire., Manufacturer: PokFhgur