Product details:

Dual rated; all aluminum body, tin plated for low contact resistance. For copper and aluminum conductors. UL listed. No. ADR6: Wire Gauge: 6 Str. to 14 AWG, Material: Aluminum, UL Listed : Yes No. ADR2: Wire Gauge: 2 Str. to 14 AWG, Material: Aluminum, UL Listed : Yes No. ADR11: Wire Gauge: 1/0 Str. to 14 AWG, Material: Aluminum, UL Listed : Yes No. ADR21: Wire Gauge: 2/0 Str. to 14 AWG, Material: Aluminum, UL Listed : Yes No. ADR25: Wire Gauge: 250 kcmil to 6 Str. AWG, Material: Aluminum, UL Listed : Yes