ILSCO Power Distribution Block, Mechanical connection, Dual Rated, Aluminum material, Tin plated connector,mounting bolt/stud size #10 in, mounting hole spacing 3.375 in., UL 1059 Recognized, C22.2 No. 65-03, Copper/Aluminum Primary Conductor 350 kcmil - 6 Str, Copper/Aluminum Secondary Conductor 350 kcmil - 6 Str, 2 conductors, 6 ports/wireways, Drive Type Main 3/8 Internal Hex, Drive Type Tap 3/8 Internal Hex, rated for 600 V, primary color Black, 3 poles, 1 ports per pole primary, 1 ports per pole secondary,