size: 1/2", 3/4", 1", 1-1/4", 1-1/2", 2", 2-1/2", 3", 3-1/2", 4" ITEM NO. 530~539 530S~539S 530A~539A material: Zinc Die Casting, Steel, Aluminum Die Casting EMT setscrew connector is used to connect corresponding EMT conduit to electical box or enclosure. Connector (steel) is constructed out of steel and has a zinc electro-plate covering. This connector is concrete tight when taped. This is an UNINSULATED connector. Listed for use with steel and aluminum EMT, IMC, and rigid conduit. For more products catalog please contact our company.