●Wire nuts assortment: 50x grey (22 - 20 AWG), 50x blue (20 - 18 AWG), 30x orange (18 - 16 AWG), 20x yellow (14 - 16 AWG), 10x red (14 - 12 AWG). Total package is 150 pieces. ●Pull the wires into connector and screw on, spring steel makes a stable connection when you are working on wiring projects. ●Maximum rated voltage for grey, blue and orange is 300 volts, and for yellow and red is 600 volts. ●Twist-on wire connector caps are made of a quality flame retardant. ●Bates wire connectors are a good idea for using in home appliances, autos and other electrical wire connecting projects.