Push-in wire connector to join and insulate 3 wires No-twist design reduces repetitive motion fatigue Minimum capacity of three # 20 solid wires, Maximum capacity of three # 12 solid wires Stranded wire range: # 16 - # 12 AWG (19 strand) and # 18 AWG (7 strand), Tin bonded stranded wire range: # 18 - # 14 AWG (19 strand) Product specifications: Rated to 600-Volt maximum, clear shell gives visual verification of your connection, UL listed to 486C CSA certified to C22.2 #188, Tough, UL 94V-2 flame-retardant shell rated at 105 C (221 F)