MARRETTE® ACS® aluminium wire connector for circuits up to 600 V and lighting fixtures and signs up to 1000 V. Made of sturdy, thermoplastic valox resin 150 °C rated. Large, finely ribbed, barrel-shaped cap makes it easier to grip even when hands are greasy or damp. Deep, wide throat ensures full insulation coverage. Inner spring made of a special bronze alloy and then plated with a thick coating of tin to satisfy the rigorous standards established for aluminium wire connections. Approved for aluminium-to-aluminium, copper-to-copper, aluminium-to-copper (or highly stranded copper) connections.