Good quality reproduction of the Lucas ST330 battery master switch. Original eqipment for Aston Martin DB2, DB MK111, DB4, Austin Healey 100/4, 100/6 and the Austin Healey 3000. The Lucas part numbers were 76605, 76604 and SSB103. Its "Unipart" cross reference was 1B2804. This switch has two large terminals and one small terminal as original