●The package includes 500 wire connector nuts. ●Simple and convenient no pre-twisted wire is required, just push the stripped conductor into the wire cap electrical and screw it on. ●Cone-shaped springs pull wires into wire caps. ●Wire connector terminals Flame retardant housing with good insulation and minimal aging. ●Yellow wire cap nut Applicable wire: 20-10 gauge (Min. 3x20 AWG, Max. 2x12 AWG)