Nimbus Insulated in-line splicer-reducer connectors, Mechanical connection, Dual Rated, Aluminum material, Tin plated connector, UL 486A/B Listed, C22.2 No. 65-03, Copper/Aluminum Primary Conductor 250 kcmil - 6 Str, Contains DE-OX®, 2 conductors, 2 ports/wireways, Plastisol insulation, Drive Type Main 5/16 Internal Hex, rated for 600 V, primary color Black, 1 poles,