Ideal In-Sure 30-1032P 32 Red Non-Twist 2 Port Connector for Solid, Stranded, and Tin Bonded Wire (100 Pack) WIRE RANGE: Solid: 12 AWG - 20 AWG, Stranded: 12 AWG - 16 AWG (Less than or equal to 19 strands) 18 AWG (7 Strands), Stranded Tin Bonded 14 AWG - 18 AWG (Less than or equal to 19 strands) TEMPERATURE RATING: 105 Degrees Celsius (221 Degrees Fahrenheit). 600 Volts maximum for building wire, 1000 Volts maximum for lighting fixtures CLEAR SHELL: With this see-through protective coating, youll be able to visually inspect proper connection in every plug NO TWIST NECESSARY: Just push the wire into one of the four compartments. This will spare you from unnecessary fatigue on the jobsite COPPER TO COPPER ONLY: Advised against using with aluminum to aluminum or aluminum to copper connections